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a few more pieces  and notice the plastic strapping

http://www.amazon.com/gp/product/B00207OT30?psc=1&redirect=true&ref_=ox_sc_act_title_1&smid=ATVPDKIKX0DER

I unscrew two screws wrapped it around the two psus and then screwed the screws back in

these two things the tape and the strap make the two psus stable and they will not shift and allow the pcie adapter to get loose.



https://i.imgur.com/KDQnI6e.jpg


https://i.imgur.com/G82YVL6.jpg

Here is a screen shot of two avalon 6's 

one is using a seasonic 1200 plat atx

one is using a meanwell 1500 watt volts adjustable.


both psu are 11.9 volts

That's 400GH difference  :o
which one runs on which PSU?

so low
 11.82   volts
  8.7      amps
2088     watts
6500     hash

.32 watts a gh

high
12.29  volts
9.9      amps
2376    watts
7200    hash

.33 watts a gh


the meanwell while great for testing is  at best 87% for power eff

I will get the pcie cables  for   the big servers on monday.

I am going to do one more setup with 2 seasonics and pull the meanwell out of duty.

what will happen is 6400-6600 gh and about .3 watts a gh with both psu's reading 11.9 or 11.8

Seems you have a bum A6, unfortunately. :(

Definitely. Server PSUs on 240V all the way. 120V and ATX is outmoded.

http://Only reason to use 120V is if you're mining in a location that doesn't permit you to modify the existing electric infrastructure, IE an apartment.

Are you measuring the sag at the the PSU modular connector or at the PCI-e connector (ie at the end of the cable?) surprising that 2 Seasonic would be defective. Remember that it's normal to lose voltage to wire resistance, you can counteract by using more wires. Perhaps 2 wires per PCI-e port with a 2 to 1 "Y"  connector.

Yes I did I just hooked up the 2 avalon 6's and I am using the middle power setting on the 4000 watt break out board.

middle power on the lcd is 12.17 volts

just about 3500 gh for each avalon 6
I will let it settle and do more photos

but if you look above the seasonic were much lower in gh 6700gh for two

to be fair my garage was at 91f  because outside temps were 72 f .    About 25 f above normal



hit switch and volts moved to 12.57 on meter

gui results are nice

I am close to 3900gh x 2 = 7800gh

Yes bear with me

this is the 2880watt break out board  with sets of 3 ft 15 gauge custom pcie cables white and with 2 ft 15 gauge custom cables yellow.

I did all in white 15 gauge to be consistent for tests.



here is the 4000 watt break out board with 10   3 ft cables
it is set to mid speed.

philipma, thanks for doing the review. I plan to buy a couple of boards once Finksy have them in stock. Does the board come with 4 pin fan connectors?

I'm confused.  The J4bbrwock breakout board I see on Holybitcoin.com only have 12 PCI-E connector each.  I order 2 of them which is 24 ports max, how come yours boards have more ports?  Also is the digital display something you add on to the board as I don't see that from Holybitcoin either.   My brother and I order 4 of these boards today.

http://holybitcoin.com/product/dps-2000bb-breakout-adapter-board/

We also went with the 3000 RPM ULTRAKAZE fans you recommended as well.   30 ports would definitely be more useful then 24.

So sad to hear that.  =(  How much for these new board version?  Looks awesome and I very excited to see Phillip hitting the higher HASH rate with these PSU's higher voltage!  CAn't wait for the boost on my Avalon.

@Phillip, how come the voltage looks different 12 and 12.2 Volt?  Also the hash rate drop to the normal 3.5TH vs 3.7+ per Avalon probably due to the lower voltage.  Can we see the Hash rate for the Avalon 6  after you crank it back to 12.7V again.  Did you see any performance increase for the S7?

Three pin.

The Amazon scythe fans are three pin.  And they are by far the best to use.

Here is why the s-7 fan is louder then the scythe fans.

Thanks for another informative review.  I didn't realize how small the DPS2000 PSU's were!  I was expecting them to be as big as the 2880w power supplies.  The noise of the 2880w IBM psu is starting to get to me.  I'm just waiting for Finsky to get them in stock.  At least I get start by getting the PSU's and fans for now.

ty Philip for your response. good idea with the fireproof blanket/noise reducing. I am waiting on a few parts to arrive but I have the majority of my set-up hooked up to my hvac ducting and utilizing the fan in the furnace to spread the heat throughout the house.

Maybe not the right place to post this question, but what is the max load (at the wall) 2880 W PSU can handle day in and day out?
90% of 2880W, 100%?, 110%?

Maybe not the right place to post this question, but what is the max load (at the wall) 2880 W PSU can handle day in and day out?
90% of 2880W, 100%?, 110%?

OK, thanks, guys.
i want to run two very good S7 with one overlocked from 600 to 650 (B5) and another from 625 to 650 (B7).
B5 is already slightly overclocked from 600 to 625 and has little error, so why not?
I think that each would do ~1350-1380W at the wall at 650.

Phil,

I love this review - thanks for all of the sharing.

I do have a question though - you must be on the East Coast since we also had record temps yesterday!

70s are unheard of mid december.  We are usually counting feet of snow here.

OK, thanks, guys.
i want to run two very good S7 with one overlocked from 600 to 650 (B5) and another from 625 to 650 (B7).
B5 is already slightly overclocked from 600 to 625 and has little error, so why not?
I think that each would do ~1350-1380W at the wall at 650.

Biodom,

PSU's are rated for DC draw (not the at the wall AC load which is after the efficiency drop).  1350W at the wall would be approximately 1,260W DC draw on the PSU using Bitmain's 93% efficiency from their own rating method.  Meaning, even if you could over-clock both S7's to 1500W at the wall (Either 5 TH w/ 135 chip model or 5.8TH/s w/ 162 chip model) you would still be under 100% DC load on the 2880W PSU.

And to answer your question, the PSU's are capable of handling >100% load, I have personally tested them up to around 3000W DC (13.5A at the wall) load for a many weeks.  However, you are going to get considerably lower efficiency over 100% load, and you are likely to reduce their lifespan. Also, once you get over 2900W DC load on them, you start getting past the recommended continuous AC load for a single C19-C20 cable (12.8A, or 3070W at the wall for the 80% rating of the connectors' 16A rating).

Personally, I like keeping them at around 90% load, or ~2600W, which 2x S7's overclocked sit perfectly in that range.

Biodom,

PSU's are rated for DC draw (not the at the wall AC load which is after the efficiency drop).  1350W at the wall would be approximately 1,260W DC draw on the PSU using Bitmain's 93% efficiency from their own rating method.  Meaning, even if you could over-clock both S7's to 1500W at the wall (Either 5 TH w/ 135 chip model or 5.8TH/s w/ 162 chip model) you would still be under 100% DC load on the 2880W PSU.

And to answer your question, the PSU's are capable of handling >100% load, I have personally tested them up to around 3000W DC (13.5A at the wall) load for a many weeks.  However, you are going to get considerably lower efficiency over 100% load, and you are likely to reduce their lifespan. Also, once you get over 2900W DC load on them, you start getting past the recommended continuous AC load for a single C19-C20 cable (12.8A, or 3070W at the wall for the 80% rating of the connectors' 16A rating).

Personally, I like keeping them at around 90% load, or ~2600W, which 2x S7's overclocked sit perfectly in that range.

Thats a lot of cord length for 12v. Be interested to see the voltage drop from PSU to miner. Hope your running at least 16 gauge.

Thats a lot of cord length for 12v. Be interested to see the voltage drop from PSU to miner. Hope your running at least 16 gauge.

Hi Phillip, which S7 batch is this that you're able to get to 5.1TH using the 2880W PSU at 625 freq?  Very awesome.  My batch 8 S7 is arriving this weekend and I'm getting a 240V connection soon so it'll be interesting to see what the 2K IBM PSU can do for it.  What Voltage do you recommend setting for the Avalon 6 and S7?  12.5?    

Seems like a lot of work and add more cost / real estate space when noise is a concern with the 2880W PSU.   I want to thank you for the recommendation on going for the 2 x 2K PSU instead.   The 2X2K IBM PSU have a much smaller foot print and noise is fully controllable based on the fan chosen.


P.S  The fan you recommended just arrived.  I don't have any brackets for these PSU.  Would those Tape you recommend be sufficient to mount these FANs.  I have that on order as well and it should be here by Wednesday.  The individual 2K board makes it much harder to combine the PSU then with the newer board you got.   Can't wait for Finksy to release the new board to the public.  I'm definitely in line to get 1.  Really love the hashing results you been publishing.  It definitely justify the cost for me upgrade to 220V outlets.

i think the 2880watter is good if you do not have a sound issue.

i would not want to do five of them if i had to sound proof them.

very nice setup.

for my garage four to five kwatts

one 2880watt and one four thousand watt dual psu will be enough.

i have one 30 amp circuit .

when i setup the 60kwatt solar with a forum member.

i think we will go with the four kwatt boards.  they are quiet and the three power settings  are really nice

Wow, you will have it "going on" with the solar.  Did you make the panels yourself?  I know as thorough as you are, you probably experimented quite a bit already with one rig on solar over a period of time.  I'm curious, are you going with double the size on battery banks than normal just in case you have a couple of days with very little quality sunlight?

Yes, I love the features available for the 2 x 2000 BB PSU's J4bberwock put together.  Unfortunately, it's too much of a pain to do the same with the 2880's.

I have yet to purchase 2 x 2000 BB.  I have the B/O Board, etc... but have not bought the PSU's yet.  Could you tell me if the 2000's are the same thickness as the 2880's?  If so, I might double stack the 2880's to have them the same thickness as the 2 x 2000's before placing the wire shelves on top of the PSU's before putting the rigs on top of them.

No Batteries.  New Jersey buys back power.

 So if you have a 60k plant it works out to about 20k  24/7  'free' power

So while the 60k plant seems large only 20k would free once you pay off the panels.

But since there are no batteries the system is much cheaper to setup.  It also does not break or need much maintenance and panels have 25 year warranty.

This will be a ground install on a 2 acre piece of land. Ground installs are very easy to fix since panels are low not on a roof.  You need land.

The guy I am working  with is on this forum and will do a reveal when we are closer to setup.
I may take a few photos of the site. Post them in a bit.

AWESOME WORK!  This will be perfect for what I need.

Nice job on the fan mount!  Brilliant.

Ingenuity at it's finest, Phil. Good work.  8)

Thanks Phillip.  Got your tracking #, can't wait to test it out.  My C19-C20 cable came today so I was able to fire up the 2K IBM PSU.  I'm just using 1 PSU at the moment since only 1 S7 is using it and waiting for the mount.  Without the Voltage changing feature, the S7 hash rate is the same on this PSU as on the EVGA.  Also since I have the older boards, I only have 24 PCI connection max when using 2 x IBM 2K PSU which means I can only connect to 2 S7 and 1 Avalon not 3 S7 like the new board.  Needless to say, I'm anxiously awaiting for the new boards.  =) Here are the picture of my temporary setup so DMwardjr can get a visual of the size of these PSU.  They are quite compact and the Ultra Kaze fan push a ton of air without being too loud.  I can only hear the S7 fans not the Ultra Kaze when both are on.  Very happy and appreciative of this PSU recommendation from both Phillip and DMwardjr.  I have 2 more S7 coming next week as well as additional IBM PSU.  Will update once I have the FAN mount from Phillip.

I love it Philip, I like to mod everything I can as well.  I am working on a 2880 mod and should have something to show after Christmas.   ;)

I love it Philip, I like to mod everything I can as well.  I am working on a 2880 mod and should have something to show after Christmas.   ;)

Looking forward to seeing this.  Please share when you have the chance.

Thanks in advance...

I did not realize how good my system is as it allows the single mount plate 2x psu to work and the  better mount plate to work.



I posted the photos of it  before and after of it setup


some cardboard packing the base plate and the mount plate
https://i.imgur.com/N6UGWXt.jpg


the 2  psu's  are in the center  of 1 s-7 and 1 avalon 6
he has the two psu's facing in two directions and the 1 yellow wire you see is powering 1 psu
he does not have the newe r2x psu plate  so he has to have his psu's in opposite directions to manage wires

https://i.imgur.com/VBv4c9h.jpg

need fan guards?

here is a good material
I have an older thread then the one above  can't find it but i used

this screen below

http://www.lemproducts.com/product/dehydrator-screen-material/jerky-food-dehydrators

works really well and since it is used in food dehydration heat and off gassing are not an issue.

I will look for some photos of it I used it for usb stick cooling


it is low cost 12 bucks for a 14 inch by 84 inch roll of it.

shipping = 6 bucks  18 dollars = 28x  120 mm fans   math could be wrong say 24
short proof will not rattle.  can take heat . won't off gas food grade material
we all know how fucking hot those sticks would get. The screens never melted

https://i.imgur.com/LZJdVx8.jpg
https://i.imgur.com/uA7cN7D.jpg
https://i.imgur.com/ovEnVLd.jpg
https://i.imgur.com/XrtMVEX.jpg
https://i.imgur.com/yF2m0mh.jpg

Do you have a link for those nylon screws and nuts?

Thanks.

New Rack arrived so I redid the PSU Mount to have the FAN at the bottom which means I no longer need the wood piece.  I also replaced the nylon screws with metal screws as it's easier and faster with the drill.  Pushing air up seems to be more efficient as hot air would rise anyway and I can always add 1 fan to do pulling later if I really want to but I don't think it's necessary with the flow going and a large box fan in the back for summer.

P.S I did use Electrical tape on the back of 1 of the Board as I didn't like how the metal could be touching each other.  The separate is less sturdy than a dual PSU attached board and can flex with so many cables pulling at it.

http://imgur.com/a/5OZmJ

Phillip please quote so the picture will show up.  Thanks.  

PSU thread is up, only waiting on sideplates from machinist shortly after the New Year: https://bitcointalk.org/index.php?topic=1308296

The 2000w PSU is not platinum, in fact it's silver but pretty close to gold. It's younger and stronger 2500w brother is gold rated, though. The 2880w beast is not actually platinum either, it is solidly in silver territory. I measured about 87% efficiency. Everyone confuses it with it's younger, slightly more buff 2980w brother the 39Y7414 (http://www.plugloadsolutions.com/psu_reports/IBM_39Y7414_2980W_SO-188_%20Report.pdf) is platinum, and much more expensive on ebay. We're all buying the 39Y7349 which has no official efficiency numbers anywhere that I can find as it's too old to have been put through the 80+ testing program. My own testing though, puts it at about 87% efficiency at 50% load.

The 105 watts saved for each S7 I'm running adds up.

Seem like a big difference. It should be 2~% efficiency difference between Gold and Platinum. You're talking about an efficiency difference that sound more like Bronze vs Plat than Gold vs Plat.

You may be correct.  I'm not familiar with what percentage puts one in silver, gold, platinum and titanium.  Maybe I should not have used that terminology.  However, I believe if one looks at the actual numbers, they can see the logic behind the power savings which opens up more available power for more revenue.

EDIT:  By the way, Prelude, did say the 2880 is more in "silver" territory than gold or platinum.  I quoted him in my post above.

If the difference is actually 8%, then yes, thats pretty big. 86% efficiency at 8X% load would be silver efficiency and 91% would be platinum.
https://en.wikipedia.org/wiki/80_Plus

It would be a good idea to double check what efficiency those PSU are supposed to make to make sure the watt difference is not a Fluke, because a 8% difference in efficiency is HUGE.

Look at the following link for the numbers on the 2980...  There are no numbers on the 2880 except for those done by members in the forums.  Prelude used a watt meter to check the efficiency at 50% load for the 2880.  He said it was more like 87% at 50% load.  Here is the link for the 2980:  http://www.plugloadsolutions.com/psu_reports/IBM_39Y7414_2980W_SO-188_%20Report.pdf (http://www.plugloadsolutions.com/psu_reports/IBM_39Y7414_2980W_SO-188_%20Report.pdf)

EDIT:  There is a possibility I'm off by 1%.  Even at 1% off on my figures, the 2980 is still very much worth getting IMHO if one is using MANY PSU's with MANY rigs.

What i'm thinking is the efficiency difference should be about 1%. A 8%, even 7% does not make sense. I'm not sure what's up with all that, maybe the 2880 tested were bad? I think this warrant more testing before throwing an extra 5-10k into 2980's.

I would also love to know the methods used to determine the 2880W PSU efficiency.  The 80+ program is more involved than just measuring input amps and output amps from what I gather.

David, if you really want to know, a good comparison would be to get one of the 2980W PSU's and measure amperage for a fixed amount of miners over 24 hours, and then do the same with the 2880W with the same miners before you pull the trigger on such a large purchase of PSU's. I'll see if I can track one down myself.

What i'm thinking is the efficiency difference should be about 1%. A 8%, even 7% does not make sense. I'm not sure what's up with all that, maybe the 2880 tested were bad? I think this warrant more testing before throwing an extra 5-10k into 2980's.

I would also love to know the methods used to determine the 2880W PSU efficiency.  The 80+ program is more involved than just measuring input amps and output amps from what I gather.

Actually, that's exactly how efficiency is determined. AC input watts VS DC output watts. There is no other way to measure it. Ecova (The company behind the 80+ efficiency program) uses hardware that is worth 5 digits to do the testing, meanwhile I'm using a $200 watt meter and a $300 amp clamp to measure DC output. My results will of course be a little less accurate, but very close nonetheless. I regularly compare my efficiency testing to the 80+ results, and I'm always very close to their results.

Also, server PSU 80+ program is more stringent since they run on 230v. Don't confuse 80+ ATX number with 80+ server numbers:

https://i.imgur.com/lmQ8r7k.png

I was wrong. 87% means the 2880W-ers are actually bronze rated, not silver.

4.4.4      Fan Load Considerations

for Single-output Power Supplies
In typical single-output
power supplies (typically used in the
rack mount servers and blade server
applications) the fans are sized not only to remo
ve heat from the power supply but also the heat
from the system. In order to facilitate the system
designer’s use of different
 cooling strategies for
the system, the power consumed by the fan will not be included for efficiency calculations. If the
power supply has an internal fan, then the manuf
acturer will give provis
ion to supply external
power to the fan during the power
supply efficiency testing. If th
e power supply does not have an
internal fan and if it fails to operate during the
efficiency testing due to thermal cutoff, then an
external fan shall be used to
cool the power supply. The power
 consumed by the external fan
shall not be included in the efficiency calcula
tions. In both cases th
e fan power used during
testing at each load setting
will be recorded for data colle
ction in determining industry
performance of efficiency
with and without fan power.

I would also love to know the methods used to determine the 2880W PSU efficiency.  The 80+ program is more involved than just measuring input amps and output amps from what I gather.

David, if you really want to know, a good comparison would be to get one of the 2980W PSU's and measure amperage for a fixed amount of miners over 24 hours, and then do the same with the 2880W with the same miners before you pull the trigger on such a large purchase of PSU's. I'll see if I can track one down myself.

That is just one small section of relevance in the testing procedure that would skew the numbers by up to 4.3% efficiency.  I also wonder if Bitcoin miners are able to maintain constant load to within +-0.5%. Or if any criteria at all were observed from the 80+ testing procedure in order for you to "Certify" it as bronze.

Again, I would love to see how you tested the units (equipment, conditions, etc). You'll have to forgive me for not simply taking your word for it.  I find it extremely difficult to believe that the Bladecenter PSU's jumped from "Bronze" to Platinum rating overnight when they built the 2980W.

Honestly if that is the case, I will gladly change all my threads to reflect it. But I was always under the impression they were in fact Platinum rated.  I'm hoping J4bberwock will chime in, as he originally had linked to the data sheet (that I can't find now) in his PSU thread before I got involved with them.

I just paid $150 with free shipping for a 2980 on eBay.  It's supposed to be here no later than January 7th.  I'll get back in touch.  However, I do want some suggestions as to the best possible tool for measuring the amperage.  If it cost a couple of hundred dollars to purchase it, so be it.  The kilowatt meter I bought on Amazon was a piece of crap.  He went out on me after about 30 days.

I saw that link what i will do is get one I will run it with the one s-7 i have and compare it directly to the 2880w i have.

use the pdu meter.   should be an easy direct comparision.

Did you power the fans externally?


That is just one small section of relevance in the testing procedure that would skew the numbers by up to 4.3% efficiency.  I also wonder if Bitcoin miners are able to maintain constant load to within +-0.5%. Or if any criteria at all were observed from the 80+ testing procedure in order for you to "Certify" it as bronze.

Again, I would love to see how you tested the units (equipment, conditions, etc). You'll have to forgive me for not simply taking your word for it.  I find it extremely difficult to believe that the Bladecenter PSU's jumped from "Bronze" to Platinum rating overnight when they built the 2980W.

That was the only thing I knew to do as well.  My PDU's have meters but they are whole numbers with no decimal points.  It simply rounds off to the nearest whole number.  I'm going to do a search to find something better if possible.  By the way, I have the APC7911 "Switched" PDU's.  I have not hooked them up yet.  They too are metered.  However, I'm not sure if they have decimal point or not.  Do you?  I have to run another 30A outlet to plug it in.  I do not want to unplug the PDU's I have going at the moment.  They have rigs mining on them.

If you happen to know of something I can get on Amazon and/or eBay that can measure properly without spending too much money, let me know please.

APC7911 has decimal points in the web interface, but not on the PDU its self.

If you want a good/accurate meter, look into the Watts up? meter, the UO version of the .net version is ideal for this kind of testing. Elsewise, I think you'll be spending thousands for something better, like a fluke power meter/analyzer.

Do we know for sure if DPS-2000BB is platinum rated? I thought 2880W was platinum rated until now.

Do we know for sure if DPS-2000BB is platinum rated? I thought 2880W was platinum rated until now.

It isn't officially rated, but I did test it. Unfortunately it's been a while, and I can't find my results anywhere, but going from memory I'm pretty sure I had measured 89% efficiency while pulling ~1500w DC from it.

I'm thinking about retesting a bunch of power supplies and making a detailed thread out of the results. If I do, it will be an ongoing process starting possibly in the second week of 2016.

Fans were not powered externally, and I believe that to be disingenuous since no one will use a second power supply to power the main power supply's fan(s) in the real world. Most server PSU fans I've come across are 5-10w. These PSUs definitely use more juice with their fans. Don't think it's enough to bring efficiency down by any meaningful amount, much less 4.3%. Where did you get that figure?

I've already described my testing methods to you. 20-25c ambient, Watts Up? Pro .net AC meter, $300 AC/DC amp clamp to measure DC amperage and multiply it by voltage measured at the load end of wires to account for vdroop. Some simple math then gives us efficiency numbers. IF you don't want to accept my methodology, I'm very open to suggestions to improve my process. It has proven to be very accurate when used with PSUs that have results posted by ecova, even when taking the fan into consideration. Furthermore, a 1500GH/s SP20E has consistently used less power at the wall using an actual platinum PSU vs the 2880W-er by a large enough amount. I do consider that a little unfair since 1 SP20E won't hit 50% load on the 2880w, but on the other hand the other PSU was close to 100% load which lowers it's efficiency.

What you call overnight is actually a 5 to 6 year difference in engineering and manufacturing, a new (better) OEM,  not to mention the adoption of PSU efficiency measures to reduce global power consumption of data centers and consumer IT and a shift to ever more efficient PSUs to meet those goals. The 2880w came before all of that. Don't see why you have such difficulty believing that it's possible. You'll have to forgive me for not taking your word that it's platinum when there is absolutely no proof of that anywhere to be found. I've only seen that it's platinum being parroted on this forum. I hope you'll do your own tests and post the results. Until then, the burden of proof is on you to prove it is platinum and not bronze.

I hope you aren't taking this as a knock on you or j4bber. It is anything but. You guys sell what I consider to be the best server equipment for mining, and I know that you both believed the PSUs to be platinum rated. I know you wouldn't have sold them as platinum power supplies without believing that they were, and no one in their right mind will think that.
Edit: With the exception of S4, what I've seen is a constant load from miners on the power supply. Never seen it move more than 0.1A while mining on S7, for example.

 You guys are too awesome, your detail reviews definitely helps others decide what is best for them (size, efficiency,  noise level, etc).  I just hooked up my next pair of IBM 2K PSU and of course I found out they are the newer Rev so I can't use them with the 4K board voltage controls (Only work with Rev 8 or lower per Finksy).  Going to order a pair of older rev PSU from FINKSY to go with the new 4K board bundle.
  
  For this new pair of IBM 2K PSU, I simply just use the Scotch mounting tape Phillip recommended.
http://www.amazon.com/gp/product/B00004Z498?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00

 Although they feel weak to the touch, these things are strong as heck when you tape them to something.  They're so strong that I didn't even bother to split out the other pair of PSU to find out the Rev #.  I only use a small piece to attach the FAN together.  Since they're at the bottom of the PSU, I didn't even need to use a mount, just place the PSU (taped together) on top and it's nice and steady on top.  I love this SCOTCH TAPE!  Make this solution clean, sexy and no obstruction to flow.  Guess I wont be needing to buy any fan mounting kit with this Tape.  Op, please quote my message so picture will show.

http://imgur.com/a/MaTjR

My pdu has 1/10 or nearest tenth. It certainly will show close enough to see a large difference between the 2880w and the 2980w.

What we all really need to know is 100 watts a s-7 or 100 watts an Avalon really the difference between the two models.

Relax  everyone  I ordered this

 I had a coupon and paid about 140 not 150

http://www.amazon.com/gp/product/B00TMPKE96?psc=1&redirect=true&ref_=od_aui_detailpages00

should be a direct fit and easy to compare to this

http://www.amazon.com/gp/product/B00VMEB944?psc=1&redirect=true&ref_=ox_sc_act_title_1&smid=A25R0MJJKVE76I


this is 76 with shipping.


so say 77 vs 150  or 75 dollars difference .

    I will run with identical testing.   and buyers can tell the watt difference   both should work fine with the breakout board.

The only thing I am sure about today is my titanium 1600 watt evga gets better watts rating then the 2880watt psu.  at freq 600

APC7911 has decimal points in the web interface, but not on the PDU its self.

If you want a good/accurate meter, look into the Watts up? meter, the UO version of the .net version is ideal for this kind of testing. Elsewise, I think you'll be spending thousands for something better, like a fluke power meter/analyzer.

Don't laugh as we all make the same rookie mistakes.  I have Dell 750W, HP 1000W, 2 EVGA G2 1300W and IBM 2K PSUs.  haha.  Now I'm debating if I should get the 2980....................................................

I'll break this up to make it easier to follow. I'll leave the discussion alone after this post...

Hi Finksy,

Thank you very much for your constructive criticism  Your frankness is much appreciated.  I also appreciate your willingness to contribute HW in Prelude's efforts to determine power efficiency difference between PSU's.  You made very good points about what would probably be the proper way to test PSU efficiency for bitcoin mining applications.  Consistency in HOW the test is performed is extremely important... Making measurements with same meter at same location with same rigs over same period of time.

I hope I did not open up a can of worms.  That was not my intention at all.  I've made too many mistakes in the beginning of my bitcoin mining venture.  I've learned [The hard way] how important it is to make an educated decision about hardware used for mining.  I don't want to continue those mistakes anymore.  I'm hoping this venture will last for many years to come.  So, I'm wanting to make the wisest and most economical decision I can make while growing into the future.

All of the time and energy invested with engineering and design with breakout boards for various PSU's and the commitment to produce these on a relatively large scale for many people by you and J4bberwock is appreciated greatly, Sir!  Thank you both for all you have done and continue to do for the community!

I GOT shipping info for the 2980 watt should come on tues or weds.

I plan to test the :

2x 2000

2880watt

2980watt

with a pair of avalon sixes  at 12.20 volts

then with a single avalon six at 12.20 volts


My s-7 is not available for testing my buddy that has an entire office floor rented got a new sublease deal..

This means he leases 80% and keep 20% for the floor.  He also pays 20% of the power  so the 13.3 cent full price power is only 2.66 cents a kwatt.

The limits are 1x 15 amp circuit  and keep the gear quiet. 

 So I hooked up 1 s-7 at freq 500  we are getting 4000th at 1000 watts with fan at 32%.    Sound is okay power use is okay.

 I ran s-3's in his place for 14 months I am hoping to run the s-7 past the ½ ing due to the 2.66 cent price.

Back to this testing.

I hope to get some good numbers and determine the difference between the 3 psu setups once and for all at about the 2000-2200 watt load

and the 1000- 1100 load

What batch miner? If its B8 i could pitch in the B8 data i get, running with ATX with known efficiency range at various load it could give a good benchmark to compare to. Though i'd be on 120v, the difference with 220-240v efficiency should be 2%.

I had a batch 2 and it is now at my buddies office.

My testing on the psus with Avalon sixes will still work since the
Loads placed on the 2880, 2980, 4000 dual 2000 will be indentical.

One Avalon six and two Avalon sixes.  Volts will be as close as possible to 12.2 volts.

SweeeeeeeeeT   ;D

Thank you very much for taking the time to do this, Phillip.

Were you also planning to get the new S7 batch 8 or 9?  I'm curious if it's efficiency would be the same as batch 6 if the batch 8 or 9 were under clocked from 700 MHz to 600 MHz?  It may be I would not have to be concerned with under clocking if the hash rate difference of 700 GH/s pays for the extra 100 watts consumed from the higher clock of 700 MHz in batch 8 & 9.  If the difference of the 700 GH/s more than pays for the extra power consumed to make extra profit, it is worth it.  If they simply offset, it would be better to under clock to try to increase the longevity of the rig.

I got 4 batch 8 but they were purchased for a friend.

 I am a bit annoyed with bitmaintech  I will try to make no purchase from them for myself as  I feel they owe me about ½ a btc in compensation.  I got a poor batch 1 that only hashed around 4500gh and they were late on a batch two shipment.  So I will  not buy from them for personal ownership  until they send me some type of compensation.
 They just blow me off at this point when I mention  this which I have mentioned to them in more then 6 or 7 emails.
So if someone wants ask me to help them order an s-7 I do. But I do not order for myself anymore.

 I ordered 9 s-7's direct 2 for me and 7 for others. I ordered an hashnest s-7 and I ordered a lee group s-7.
So that is 11 s-7's  at this moment I have 1 s-7 at my buddies office and 1 s-7 mining in China with lee's group
I have 2 avalon sixes in house and most likely I will order at least one more avalon 6.
Since I have no hope of bitmaintech giving me coupons or compensation any that I order from them will be for friends not myself.
Sad since I have purchased more then 40k in gear from them.

I have to say one thing the batch 2 rated at freq 575 has been the best miner I ever purchased from them  it will go as high as freq 637 and 5150 gh. 

I have it at my friends office down clocked to freq 500 and 4000gh (need to keep it quiet) Since I pay 2.66 cents a kwatt that one will make money.

Sorry to hear that.  I'm hoping my RMA doesn't take very long with bitmain.  I recently sent back 3 blades for replacement.  I'm hoping they get them some time next week and send the new one's back to me in the mail before next week is over.  I hate the waiting game.

By the way, how do you think the Avalon 6 will handle the heat this summer?  Did the firmware update come out yet that's supposed to do something to reduce the heat?

Assuming it's the fan I think it is, it's a Sliverstone - here's the black version:

httvVCc ---------I disabled your link

They're nice fans - really quiet and has a couple speed settings which are nice.  I only wish they had a PWM version...

....

the one below is not a referral

and it is the fast one 2000 rpm

http://www.newegg.com/Product/Product.aspx?Item=9SIA4TZ2T50267&cm_re=silverstone_180mm_fan-_-35-220-048-_-Product


looking for a better price then newegg.


the better fan but still not cheap:

http://www.amazon.com/Silverstone-Penetrator-2000rpm-Channeling-AP182/dp/B008VQ2Y2M/ref=sr_1_1?s=electronics&ie=UTF8&qid=1451845806&sr=1-1&keywords=silverstone+sst-ap182


I will try ebay:

http://www.ebay.com/itm/Silverstone-AP182-180mmx180mx32mm-Wide-Blade-Air-Channeling-Speed-Control-Fan/271036161367?


now a costly product for the fast one   forty bucks.

but 3 sets of oem server fans burn a shit ton of watts  this fan does 3 2880watt or a mix of 2980 and 2880 watt psu's


15.6 watts to cool 3 2880 watt psu's !!!

https://i.imgur.com/TYKr9Al.png

Assuming it's the fan I think it is, it's a Sliverstone - here's the black version:

http://amzn.to/1OEvVCc

They're nice fans - really quiet and has a couple speed settings which are nice.  I only wish they had a PWM version...

I am going to buy the silverstone  ap 182 and use it to show  watts saved and sound level.


@ kilo17  you are going to cost me money ;D


found a review on the fast model:




http://thermalbench.com/2015/06/17/silverstone-ap182-180mm-fan/

and found a better usa price. no referral link here it is.


https://www.performance-pcs.com

http://www.performance-pcs.com/silverstone-sst-ap182-air-penetrator-180mm-case-fan-w-adustable-speed-control.html 

 28 bucks and 10 to ship via usps

kilo17,

Looks really cool. I wish I waited a few days before ordering a whole bunch of 2000W PSUs and fans.

Your investment is safe.  Per S7 wise, the 2000W PSU bundle is still the best bang for the buck with no mods required.  Quiet as a whistle with the Ultra KAZE fans.  The fact that you can add voltage changing abilities is just extra bonus on top.  I may get 1 x 2980 to play with it in the future but most of my purchases are still leaning toward the 4K bundle with the 2x 2KW IBM PSU until the 2980 becomes more affordable.

Your investment is safe.  Per S7 wise, the 2000W PSU bundle is still the best bang for the buck with no mods required.  Quiet as a whistle with the Ultra KAZE fans.  The fact that you can add voltage changing abilities is just extra bonus on top.  I may get 1 x 2980 to play with it in the future but most of my purchases are still leaning toward the 4K bundle with the 2x 2KW IBM PSU until the 2980 becomes more affordable.

Kilo,

love the mod on the 2880W PSU's, that is killer.

Maybe we need a DPS-6K triple-2000W PSU using a single 180MM fan?  :)

Kilo,

love the mod on the 2880W PSU's, that is killer.

Maybe we need a DPS-6K triple-2000W PSU using a single 180MM fan?  :)

I have two of the high speed fans coming in. Along with a lot of other stuff.

2980 watt

a clamp meter.

a special power cable diy that will allow for reading amps to .01

the two fans and two grills.

I am hoping to run these test and setups by fri or thur.

I tested it last night and now I am going to make a proper plate to mount the fan.  I didn't want to waste time cutting one out if the fan wouldn't keep it cool.  I did leave a channel between the PSU's by stacking them to aid in cooling although I am not sure if the channel reduces the pressure and limits the flow through the PSU's.  ???

Kilo,

love the mod on the 2880W PSU's, that is killer.

Maybe we need a DPS-6K triple-2000W PSU using a single 180MM fan?  :)

Did you mod one of the 2880 PSU to run the fan or do you just run the fan on a standard ATX PSU?  I wonder if there are PCIe to 3 pin fan cables.

Thanks, I am telling you it is the most quiet fan for the cfm.  I would love a triple 2000  ;D

Please quote so the picture will show.  Please don't mind the 3 fans.  I'm doing Heat stress test and exhaust test with 3000CFM, 7000 CFM Axial fan and 600 CFM Centrifugal.

@Kilo17 - How do I cut /connect the cable or connect for the 182 version that is 3PIN with 1 manual controller for FAN speed?  Or can I just connect this to the 3Pin FAN Controller on Finksy / J4bberwock board?

NOW THIS IS A GOOD IDEA!  Triple or QUAD 2000PSU with 1 FAN.  Muahhahahah.  DO IT!!  I'm building with many 2K PSU.  If I can stack more than 2 in the same space since I have plenty of height space, it would be a huge space saver!  I'm going to order 1 right now for fun and compare it against 4 x 2KW PSU stackout on top of each other with 4x Ultra KAZE Fans blowing from the side.

See my RACK.  I can easily stack 3-4 x 2KW PSU with this FAN Mod.  It would also be much more efficient cable management wise with the new 4K Board then my single boards which have to be spread side ways and waste too much space.  I put 2 x 2KW PSU combo opposite as they spread too wide sideways so the other other pair of PSU using single boards will be running PCIE from the back to maximize space.  With the 4K boards I have coming next week, I won't have this issue and I can stack 4 PSU on top of each other with no issues and cabling will be much easier and neater.

http://imgur.com/Wntew7g

Please quote so the picture will show.  Please don't mind the 3 fans.  I'm doing Heat stress test and exhaust test with 3000CFM, 7000 CFM Axial fan and 600 CFM Centrifugal.

@Kilo17 - How do I cut /connect the cable or connect for the 182 version that is 3PIN with 1 manual controller for FAN speed?  Or can I just connect this to the 3Pin FAN Controller on Finksy / J4bberwock board?

What is a BB board?  Is that a control board?  

Bitmain is selling BB boards, 18 pin (120mm) signal cables, fans, etc...

BB Boards:  https://www.bitmaintech.com/productDetail.htm?pid=00020160105102242316JqapyMif0705 (https://www.bitmaintech.com/productDetail.htm?pid=00020160105102242316JqapyMif0705)

18 pin signal cable:  https://www.bitmaintech.com/productDetail.htm?pid=00020160105105043457FPP8X92I0616 (https://www.bitmaintech.com/productDetail.htm?pid=00020160105105043457FPP8X92I0616)

120mm fan:  https://www.bitmaintech.com/productDetail.htm?pid=00020160105104607947aoAkWsJK06D0 (https://www.bitmaintech.com/productDetail.htm?pid=00020160105104607947aoAkWsJK06D0)

The BB board is like a RasPi board, but you need the daughter board, the other board you plug into the BB that has all the ASIC and fan connectors, to actually use the miner. I'm not sure that ordering the BB there is going to include a daughter board hat you would need.

But i guess that if its the BB failing, you can re use the daughter board. I could not tell, however.

okay my first of 3 2980watt platinum psu's arrived.

I hooked it up to my 2 avalon sixes and I am using 2000 watts to do 6800gh


My 2880 watt psu uses 2124 watts to do 6800gh


this is a very fast down and dirty comparison.    this is about 72 kwatts a month

at 10 cent power 7.20 usd a month  so if you find cheap 2980watt psu's buy them  


I have 2 psu's on order from this seller.  If they are are good as the one that arrived today these are a good price.

he sold me 2 at 80 each.

http://www.ebay.com/itm/161937378976?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

now back to rating the 2880 watt vs the 2980 watt  

2000 watts vs 2125 watts     if this is a true measurement  it is 6% different  putting the 2880 watt like a silver and the 2980 watt like a platt.

I will do more tests with a lot of photos and proof.

One issue with tests is volts provided need to match.

ie I know the draw id setup the same two avalons at freq 500 fans at 40%.

but if one psu provides 12.22  and one psu provides 12.19   my results would be off.


BTW the seller has 8 of the 2980 watt plats left.

longer test below

30 min

2880 watt

amps 9.1
volts 241
dc  12.20
dc  12.10
dc   12.00
hash 6879
watts 2193
watts per gh 0.3188

Philip,

you always find the best deal, last time I checked the lowest price was $150. Thanks for doing this.

I'll break this up to make it easier to follow. I'll leave the discussion alone after this post.


The 2880W PSU uses 3 60x38mm fans that are rated for 1.68A each.  At the PSU's typical 12.2V output, that would be maximum of 20.5W each, for a total of 61.5W.  @ your 50% load testing of 1440W, that could account for a margin of error up to 4.27% if they were at max load.  I don't think following the testing procedures for 80+ should be considered disingenuous if you are going to use their outcome/ratings in your assessment of the PSU.  If anything, I think it's disingenuous for you to use their rating label if you are going to ignore their protocol whether you agree with it or not. I'm not here to debate the real-world meaningfulness of Ecova's rating system, that is for the end user to decide for themselves just as EPA ratings on new vehicles (and not real-world fuel economy) are up to the consumer to interpret.  What I wouldn't do though is tell the dealer that the EPA rating on my new car is wrong based on my own fuel economy, if I'm not willing to replicate the EPA's testing procedure myself.

I do agree that the cooling setup used by the 2880W PSU's is not very efficient, it relies on small diameter high RPM fans to push air through a long narrow tunnel filled with components. Most ATX PSU's use very large single ~0.6A fan (~7W) to cool them, which is why they wouldn't have had near the impact in your testing in the past.  Thankfully MarkAZ has nearly finished his acrylic solution to replace the loud stock fans with a single 120mm fan which will reduce noise and wasted power from the 3x screamers.

These PSUs do use a very large amount of power for cooling vs typical PSUs. That said, what matters to the end user is efficiency at the wall. The fans being powered needs to be included in that efficiency figure when miners calculate power requirements. Of all the PSUs I've tested, none of them were measurably affected by their fan's power consumption vs the ecova testing results. I know this case is special considering the 3 screamers, but it is what it is.

 
Where do you put the DC amp clamp to measure the DC load by the miners, do you have to take 1 strand of a PCIe cable or can you group them all in together? I'm honestly curious about that, seems interesting as a way to compare miner efficiency vs manufacturers published specs. And to see if for example the SP20e's DC Watts are accurate from the GUI.

SP20 @ 1500 GH/s is only 900W DC IIRC? So your 87% efficiency was measured at that load or at true 50% load?  This is the stuff I'm mainly interested in about your testing method (and I apologize if you've already posted about it) all I read was that you tested 87% efficiency at 50% load, which would have included fan draw of up to 60.5W of that.  However, if it was the SP20E @ 1500GH/s, load would be a fair amount less than 50%. Also, depending on what the fans were drawing and the DC load, the fans could make up more than the 4.27% figure of the energy consumption if it was less the 1440W load I thought it was. I'm very interested if you managed to test it at different loads to see if it was consistent? The real-world impact of this is that fans in general would make up a significantly lower portion of the wasted power (reflected as inefficiency in your test) at 100% load than they would at 20% load. This would also skew the results when comparing the efficiency of a PSU @ 100% load to a larger PSU @ 30% load, which is what I interpreted you as saying.

If you are open to suggestions, what I would love to see is a straight AC draw comparison vs a known similar 80+ platinum PSU at 50% and 100% DC load.  I have 2x 2980W PSU's coming and would be happy to lend one to you, along with another 2880W PSU for redundancy to test and show your results here. If you have enough mining power to load it up that is. Since it's impossible for anyone to make a definitive conclusion without actually following Ecova's guidelines, I think a comparison vs a near identical and known tested 80+ platinum PSU like the 2980W would be as close as one could get.

The amp clamp goes as close to the miner's connectors as possible with all 12v strands bundled together.

My SP20E testing goes back at least 6 months, so I can't remember exactly and as I said I've lost my documentation of the results unfortunately. I do plan on testing another SP20E soon enough, though, to compare 2 smaller platinum server PSUs I'm using. I'll get back to you with SP20E figures then. I'd be happy to test your PSUs, but after taking a quick glance through the thread before replying I think Phil has that covered.  


What you're saying about the timeline makes sense and could absolutely be right, it just didn't seem to me like much was changed through the years with the 2880W PSU's. And if it had, that it wouldn't have happened all at once with a new model.  All I am interested in is the truth of this.  And what you've showntold me is not exactly compelling, just that you tested the PSU @ 50% (or possibly 30% load if it was a single SP20, which i'm hoping you can clarify) and claim Bronze-level efficiency.  But you didn't follow 80+'s guidelines to determine that, and are now arguing that those guidelines are disingenuous...

The 2880w has nothing to do with the 2980w. The only thing they have in common are their exteriors and interfacing connector. IBM commissioned Delta to make an updated, slightly more powerful, and significantly more efficient power supply than Astec was providing them with in regards to the 2880w. Changes made to the 2880w PSU between the first revision and the last have absolutely no bearing on what has been done with the 2980w, especially since it's not the same company manufacturing them.


I realize I may be coming off as abrasive, and for that I apologize. The truth is I'm not taking this personally, I'm just learning now about how they actually rate PSU's, and learned how much wasted energy the fan packs on the 2880's could be burning (which makes me hopeful to test out and offer MarkAZ's alternate acrylic panel to mount a single 120mm fan instead).  Now what I would like to know is if these PSU's would actually meet the ratings that I was under the impression they met, and I believe the best way to do that (if you are willing) would be to have you compare the 2880W to the near identical and tested platinum 2980W PSU, to take your methods/equipment out of the equation (even if the method/equipment isn't perfect, it should be consistent enough to show a difference as significant as this).  If they do not match, I will be more than happy to change the wording in my threads.  The last thing I or J4bberwock are trying to do is to deceive anybody.  I started selling the product because I believed it was the best solution on the market, and still believe that today.

I have a bunch of server PSU's I could lend you for your PSU efficiency thread you mentioned too, DPS 2000's, DPS 750's, 800 GBA's, etc.

I'm absolutely willing to test both the 2880w vs the 2980w for you if you want. I'm 99% sure the 2980W-er will pull about 6-7% less than the 2880W-er at the wall, which is the only thing that counts IMHO. I have the means to load both PSUs anywhere from 20%-100%. Using a single 120mm fan will definitely help the 2880w PSU to consume less at the wall, but the same is true of the 2980w.

Thanks for the offer on the PSUs, but I already have quite a few units to test which might take a while depending on my work load. I'm not looking to become the next jonnyguru or anything, nor do I have the necessary skills, equipment, or knowledge to do so. I may consider taking requests for reviews of specific units that I don't have on hand eventually, but the unit would have to be provided by the requester if I don't have it on hand. Doubt that will happen, though.

I tested it last night and now I am going to make a proper plate to mount the fan.  I didn't want to waste time cutting one out if the fan wouldn't keep it cool.  I did leave a channel between the PSU's by stacking them to aid in cooling although I am not sure if the channel reduces the pressure and limits the flow through the PSU's.  ???

my pleasure.

more results on the  2880 watt

1 hour

amps  = 9.0
volts   = 241
dc      = 12.20 at the one un - used pcie cable
dc      = 12.10 at avalon 1 software reading
dc      = 12.00 at avalon 2 software reading
hash  = 6872
watts = 2169
watts per gh = 0.3156

I will give 4 more readings on the 2880w   the garage is cold as cold weather has arrived in NJ

I will go back and do  that same on the 2980

Some caveats the  fan packs are a bit different.
I have yet to pull the 2980watt fan pack apart.

so while I know that the 2880 watt is using 60 watts in its fan pack  I do not know that the 2980watter uses  60 watts

so while it appears to be 125 watts difference in the early tests I think the difference may be more like 90 to 100 after all tests.

And do not forget  kilo17's  3x 2880 watt  fan mod  is kick ass  as it should save  150 to 160 watts for 3 psu's

Thanks for the early results. Looks like I was right in regards to efficiency. Are the 2980W-ers as loud as the 2880W-ers? Should require less airflow since they're running more efficiently thus less heat waste to inefficiency.

have you finished your 2880 watt psu tests?

No but I have one more a two hour test

and it is pretty much the same as the 1 hour test.

2880 watt psu tests

30 min

amps 9.1
volts 241
dc  12.20
dc  12.10
dc   12.00
hash 6879
watts 2193
watts per gh 0.3188

1 hour

amps  = 9.0
volts   = 241
dc      = 12.20 at the one un - used pcie cable
dc      = 12.10 at avalon 1 software reading
dc      = 12.00 at avalon 2 software reading
hash  = 6872
watts = 2169
watts per gh = 0.3156

2 hour

amps  = 9.0
volts   = 241
dc      = 12.20 at the one un - used pcie cable
dc      = 12.10 at avalon 1 software reading
dc      = 12.00 at avalon 2 software reading
hash  = 6849
watts = 2169
watts per gh = 0.3166

I would do two more sets of tests  a 4 hour and a 12+ hour

I did pul the 2980watt apart and fans are mounted differently but are delta fans use 1.68 amps each or about 5amps at 12 volts for all three = 60 watts.

they are mounted better I took a lot of photos will post them. in the morning.

...

they are mounted better I took a lot of photos will post them. in the morning.

Are you... talking to yourself? LOL  :o

DAAAAAAAAAAMN....  LOL

Those are some big ass caps.   LOL

got to go to a meeting I will post more tonight.

thanks for spacer I have been told to not double post as people perceive it as advertising my signature. sometimes I want a new post to show info more clearly.

Haha, I want to LIVE.............When you have a chance, please also compare where the 2000W PSU stack up in the efficiency.  I'm assuming it would be somewhere in the middle.   Also can I trust my Wemo Insight?  It's showing that the B8 S7 is pulling 1540W at the wall.  That sounds way too high for such an efficient PSU like my EVGA G2 1300W.

Just my luck that I only have enough power to run two 2880 PSU and not three.  I wonder if it's possible to use the 180mm fan with just two units stacked.

Maybe 2 120 or 140 mm fan will work? I have 2 2980W PSUs coming on my way, I will be able to check. Good thing is 2980W has built in 3 pin header for fans so adding any fans would be easy.

Are those standard 3 pin headers?  I hope the 2880s have them too.  I'm not sure that the area is wide enough for two 120mm fans since kilo's 180mm seems to fit pretty well.

The B8 S7's pull around 1330W DC (rating of 1422W at the wall with 93% efficient PSU as per bitmain's specs) which is over 100% load on your EVGA 1300. This would make effective efficiency 86-87%%, which would be about right considering how high the load is on it.

Thanks Finksy, guess no more using the EVGA going forward and just stick to my 2000W PSUs.  Can't wait to get your new 4K boards!!!!!!!!!!!!!!   


Phillip - What should I expect at the walls w the 2K PSU for Batch 8 @standard Freq?

It should be 99.46% load on a 1300w G2. The math is 1293W/0.88eff(@120v input)=1470W at the wall. Just a bit over the 12A/15A 80% limit. Not excellent but not bad either. Should be getting mine tomorrow to get some real world tests.

3m double side tape works if you have the older single breakout boards board and grilled shelf system

this is nhando's twist on my mount



these feeders who sells them?
and how much they cost?
here you go :
he double side tape the two fans

https://i.imgur.com/znLQrIA.jpg

 he uses the shelf as a grill and base
https://i.imgur.com/4bvp7Jx.jpg

lastly he gets good wire management  this is 2 single 2000 watt breakout finksy j4bberwock boards

https://i.imgur.com/RQKB0Z3.jpg

the dual 2000/net 4000 setup has 3 volts setting and some more tweaking with a small pot.

volts  =    240
dc     = 12.84
dc     = 12.7
dc     = 12.5
dc     = 12.2 backprobe numbers
watts              =2880   
hash               = 8000
watts per gh    = 0.3597   I know the avalon chip burns more power when overclocked so this is not a helpful judge of the psu's eff


= Me LIKEY LIKEY......  I can't wait until my new 4K board on Monday to Just START my A6 to get it to 3.9-4TH.   It's gimping along at 3.2 now.  That's almost like getting 2 S3 for free with less power used.   

where you buy these psu IBM?
they are cheap?

I shoul pay you a visit.
Just to here those psu's screaming away!

Can you really hear them if they're quieter than the S7 or are they quieter but make more annoying higher pitch sounds?  I have a bid on a few to play with.

Sounds Nasty as in a loud pitch sound or annoying whine?  

Sounds Nasty as in a loud pitch sound or annoying whine? 

Canceling order.....thanks for the heads up.  I will reconsider them as an option once I move my equipment to the warehouse.

The dual 2000 /4000 is for in house.

I hope to get more avalons to be able to test better.

I think I can use the dual 2000/4000 and the 2980 using the large fan mod from kilo17

I might go with the double DP2000 for my Avalon (which it is not a lot more cash then an EVGA G2) and I would be able to overclock it.

I'm wondering with my ambient temp of 25-30 (77-86 in the US) what the min CFM I would need to cold them. I might plug one or two SP20 with it also ... so not full load but still. Finksy suggest min 100 CFM.

I see that Phil use two Noctua NF-F12 but they cost another 50$ us for the two but they are 71 CFM. I was looking at two silent fan but they are only 52 CFM ... that won't be enough

Not sure what would be best for me.

Dave,

I'm not sure about using those. What's the duty cycle on them? Car radiator fans don't run 100% of the time the car is on, and I don't think they're built for it.

Thanks for chiming in.  That's why I wanted opinions for this application.  I'm not sure on the duty cycle.  It sounds like I need to do some research. 

EDIT:  If you happen to know of a 12 inch fan with long duty cycle and low watts, please let me know.

Yep, don't want to end up with something that won't do the job and have to buy twice. Might end up having to use something 120/240v since a 100% duty cycle fan will probably tend to be AC in that format I imagine? Not sure though.

the 2980 psu's and the 2880 psu's sound nasty

as does the s-7

I can get the 2880's and the s-7 to sound okay.

I need to play with the 2980 more.

They are $29.99 each.  So, they are not very expensive at all.  I think I will go ahead and order 8 of them and an IBM 2000 BB PSU.  I already have a breakout board.  I want to see how they do before I buy 16 of them.

By the way, could I simply reverse polarity on my hookup to the PCI-e cords to get the blades to rotate in the appropriate direction if I need to OR will I need to take the propeller off and reverse it?  It says they can be used as push or pull which has me believe reversing polarity may do the job.

It depends on the exact type of DC motor.
 
If it's a modern DC motor, with an electronic controller, you can't, not without changing a strapping option onthe controller chip, sometimes not even then.
 
If it's a permanent magnet motor with a commutator, just reverse the polarity, although some such motors are not designed to be reversed and will work poorly or burn up the brushes.
 
If it's a DC motor with a stator winding, reversing the polarity will NOT reverse the direction of rotation, you have to reverse either the polarity going to the stator or to the brushes.

Does anyone see an issue with powering the radiator fans with an IBM 2000W BB PSU?  I'm going to take the plunge to try it out.  I need to know before I purchase 8 of them on Amazon to install in one door of my mining closet.

Any help would be appreciated.  I personally don't see an issue powering them with the IBM 2000W BB PSU.  I just want to make sure.  One of you may know something I don't...

I would think the way to wire it up is similar to the way Kilo wired up his 180mm fan for the 3 x IBM 2880's.

Quick google search about reversed polarity:


So, it may work that way.


Yes, it will power them just fine. 12V DC is 12V DC, the fan won't know what's supplying the power.

I don't know if this is something that needs to be considered, but genrally a charged car battery is about 12.8v and close to ~14.4v while the alternator is charging. The DPS2000 will be 12.25v unless you play with it. Shouldn't be an issue I imagine, just slightly different amperage.

Looks like 3 s7 batch 8 are a bit too much for this dual psu ??? or am i mistaking?

Looks like 3 s7 batch 8 are a bit too much for this dual psu ??? or am i mistaking?

Very cool.  I thought those switch are to individually power on and off each PSU just like when you have separate boards.  Didn't know 1 was for voltage changing.  I think Finksy should add that info in his thread.  Currently it's powering 3 x Batch 8 S7 running at 700M Freq and the Voltage displays shows 12.3 or close to that.  I will look at that spot in the morning as that spot is so crowded with the FAN and the power cables.  I can changing the Voltage while the PSU is powered on?  

Does anyone see an issue with powering the radiator fans with an IBM 2000W BB PSU?  I'm going to take the plunge to try it out.  I need to know before I purchase 8 of them on Amazon to install in one door of my mining closet.

Any help would be appreciated.  I personally don't see an issue powering them with the IBM 2000W BB PSU.  I just want to make sure.  One of you may know something I don't...

I would think the way to wire it up is similar to the way Kilo wired up his 180mm fan for the 3 x IBM 2880's.

After seeing DMwardjr's Youtube video about respecting Electricity and that guy getting fried by high voltage, I have a fear of even touching power cords....  Haha.  Only tried and true for me, especially after Phillip did another 1 saying, open the PSU at your own risk,,,,,,,,,,,,,,,.DEAD Meat.  So I will only do what is considered tried, true, rinse, rather and repeat solution.  No wild cowboy moves for me.  Still have 2 kids to take care of.  =)  

P.S Thanks for the heads, up.  Going to the Garage now to fiddle w the Voltage thing.  


Update - The switch only have 2 position on my 4K board.  Maybe I have a bad unit?  Pulling it up shows 12.11V and pulling it down gets me 12.26-27.  There is nothing in the middle or any other settings. I even tried taking out the nut / washer to make sure it was causing it to be stuck.  Even tried pulling to the left and right.  No dice =( 

What do you mean trim it?  Remove the switch and cut something?  or remove the switch adjust it like Kilo's example?

You are the MAN Phillip.  Pictures are worth a thousand words as they say.  I thought that was just a screw, didn't even know it's a Trimming / adjustable thing.  WOOHOO.  12.55V now.  Will connect the Avalon to this Board later this week.  Right now it's busy warming up the house.  Yes, I just starting doing the NiceHash casino on Kano pool.  It's paying off for me with the current luck while I work on finishing up the 400AMP upgrade.  


Update - Now that I'm over volting it to give it more juice, they seem to react much better to the 731M frequency then when at just 12-12.2V.  Testing this for a few hours and see how stable this is as I'm surely over stressing my 2x2KW PSU at this load.

Good tip.  Just playing with the different setting to see the potential, I will reduce the voltage for the S7.  Only getting this more for the Avalon.  

Just curious - What ambient temperature were those guys running that they burn their boards?  My garage is currently 65 degrees right now so I'm not as concern for a short test.  What hash rate would I get at the lower voltage and that freq you mention?

some were under 50f

maybe 4600 vs 4730

some were under 50f

maybe 4600 vs 4730

I sent a PM to Finsky and waiting on a response but figured I would ask here.

I was sent the 4k set-up, purchased my own fans and set it up and the PSUs made crackling sounds. I assumed with the c19-c20 power plug from PSU that it would work with my 240v PDU (just like the 2880 set-up I currently have from finsky). I looked at the power cord and saw a small sticker that says 120v 15 amp, so I am thinking I have to buy a separate power cord c19-c20 rated for 240v 30 amps for both PSUs to work with the PDU but I am afraid that the crackling might have fried the PSUs utilizing the 120v plugs.



Please let me know your thoughts. thanks!

You have a different issue. The power cords are good.
The wires can handle 240 volts.

Need photos  of the setup.

Need to know if you crossed the pcie cables as you can put them in backwards.

Do you power on with no pcie cables .  Just the fans and no miners?

Just the fans, no miners. Is that the issue? I had to buy the fans separate and was going to try a few ways to set it up before attaching the miners.

You have a different issue. The power cords are good.
The wires can handle 240 volts.

Need photos  of the setup.

Need to know if you crossed the pcie cables as you can put them in backwards.

Do you power on with no pcie cables .  Just the fans and no miners?

@ nhando. You should save 3-5 percent per gh so 26/27 is how much it will reduce watts per gh on my model

On your model it should be 30/31 or so per gh of hash

Wow, so for the 130 GH dropped, I save 30*130 or 390Watts?  That sounds too good to be true?   My math might be wrong but if I do 5% off of 1500Watts at the wall is only 75 watts.  so it's more like almost 2 watts per GH saved?

Just the fans, no miners. Is that the issue? I had to buy the fans separate and was going to try a few ways to set it up before attaching the miners.

Can anyone tell me HOW I would connect this 280mm x 280mm x 80mm fan to 230 Volts?

Bearing Type:Ball.Current Rating:790mA.Flow Rate - Imperial:1077.1cu.ft/min.Flow Rate - Metric:1865m/h.Frame Dimensions:280mm x 280mm x 80mm.Frame Size:280mm.Noise Rating:66dBA.Power Connection Type:Terminal Block.SVHC:No SVHC (16-Jun-2014).Series:W2E.Supply Voltage:230VAC

http://www.amazon.com/EBM-PAPST-W2E250-HL06-01-AXIAL-230VAC/dp/B00MMX9B5S/ref=sr_1_1?ie=UTF8&qid=1452666821&sr=8-1&keywords=Ebm+Papst+W2E250-Hl06-01+Axial+Fan%2C+280Mm+X+280Mm+X+80Mm (http://www.amazon.com/EBM-PAPST-W2E250-HL06-01-AXIAL-230VAC/dp/B00MMX9B5S/ref=sr_1_1?ie=UTF8&qid=1452666821&sr=8-1&keywords=Ebm+Papst+W2E250-Hl06-01+Axial+Fan%2C+280Mm+X+280Mm+X+80Mm)

Can anyone tell me HOW I would connect this 280mm x 280mm x 80mm fan to 230 Volts?

Bearing Type:Ball.Current Rating:790mA.Flow Rate - Imperial:1077.1cu.ft/min.Flow Rate - Metric:1865m/h.Frame Dimensions:280mm x 280mm x 80mm.Frame Size:280mm.Noise Rating:66dBA.Power Connection Type:Terminal Block.SVHC:No SVHC (16-Jun-2014).Series:W2E.Supply Voltage:230VAC

http://www.amazon.com/EBM-PAPST-W2E250-HL06-01-AXIAL-230VAC/dp/B00MMX9B5S/ref=sr_1_1?ie=UTF8&qid=1452666821&sr=8-1&keywords=Ebm+Papst+W2E250-Hl06-01+Axial+Fan%2C+280Mm+X+280Mm+X+80Mm (http://www.amazon.com/EBM-PAPST-W2E250-HL06-01-AXIAL-230VAC/dp/B00MMX9B5S/ref=sr_1_1?ie=UTF8&qid=1452666821&sr=8-1&keywords=Ebm+Papst+W2E250-Hl06-01+Axial+Fan%2C+280Mm+X+280Mm+X+80Mm)

Can anyone tell me HOW I would connect this 280mm x 280mm x 80mm fan to 230 Volts?

Bearing Type:Ball.Current Rating:790mA.Flow Rate - Imperial:1077.1cu.ft/min.Flow Rate - Metric:1865m/h.Frame Dimensions:280mm x 280mm x 80mm.Frame Size:280mm.Noise Rating:66dBA.Power Connection Type:Terminal Block.SVHC:No SVHC (16-Jun-2014).Series:W2E.Supply Voltage:230VAC

http://www.amazon.com/EBM-PAPST-W2E250-HL06-01-AXIAL-230VAC/dp/B00MMX9B5S/ref=sr_1_1?ie=UTF8&qid=1452666821&sr=8-1&keywords=Ebm+Papst+W2E250-Hl06-01+Axial+Fan%2C+280Mm+X+280Mm+X+80Mm (http://www.amazon.com/EBM-PAPST-W2E250-HL06-01-AXIAL-230VAC/dp/B00MMX9B5S/ref=sr_1_1?ie=UTF8&qid=1452666821&sr=8-1&keywords=Ebm+Papst+W2E250-Hl06-01+Axial+Fan%2C+280Mm+X+280Mm+X+80Mm)

Gave up on the other 2K CFM Fan DMwardjr?

It probably has terminals for you to connect the wires to directly, then you can put whatever plug you want on the other end? Nice looking fan.

Not sure but Papst makes some badass fans

So, this is not a fan to connect to 12VDC apparently.  It sounds like [From what you are saying] I need to buy a cord from Amazon or local hardware store for 208 to 240 VAC and wire it up to the fan [Plugging it directly into 208 to 240 VAC?  If this is the case, do you have any particular 208 to 240 VAC receptacle and cord to recommend?

So the "Duty Cycle" on these fans is for quite a long time?

The reason I ask is because the "Duty Cycle" on the radiator fans at 100% 24/7 is probably only about 2000 hours (83 days).

Yes, not 12V DC, it's 220-240V AC. It's rated at 181.7w (0.79A x 230v) so really any wire will do. I'd probably use 14AWG flexible extension wires since I have plenty of that lying around, but you could use 18AWG with ease. If you're going to have a bunch of them on your door, I'd skip the plug and wire them all together in an electrical junction box wired for 240V.

I think you're confusing duty cycle with MTBF. I have no doubt that those Papst will last MUCH longer than the radiator fans, but you should look up their rated MTBF.

Anyone know if these IBM PSU will automatically shutdown at certain temperature threshold?  Just preparing for the summer especially since power 3 x S7 Batch 8/9 will be maxing these PSU at 100% load.  Want to make sure there's some extra safety built into these PSU like how the Antminer have auto shutdown at 80C

4000 watts and 3 S7's should run fine- you have plenty of headroom

I am stable running 3 avalon6 on a single 2880, I suspect I will run into those issues without proper cooling. :o

I ran 17 amps x 240 volts = 4080 volts for 3 ½ days

 2 scythe fans cooled the  dual psu  zero issues

i was doing 2 avalon6's and one s-7

I ran 17 amps x 240 volts = 4080 volts for 3 ½ days

 2 scythe fans cooled the  dual psu  zero issues

i was doing 2 avalon6's and one s-7

4080w x 0.89 = 3631w DC, so you were still under the 4000w spec.

I've run 2 DPS2000 for about a week pulling 4500w DC from them and they didn't even blink. They are super tanks, massively overbuilt. The fact that you can adjust the OCP protection up to 196A via a trim pot should give you an idea.. These guys were overbuilt and under speced to 2000w in order to get higher efficiency I believe. When you're running at 100% 2000w capacity, it's likely that you're only actually using ~80% or so of the PSU's capacity.

Great to know, thank you!

Got my Avalon 6 Baby on 12.5V right now.  So far so good at 3879GH/s.  Let's hope it remains at that level.  Temp is at 74 / 76C which makes me feel a bit uneasy.  Just raise min FAN speed to 60% to be safe which brought it down to 73/74C.  Either way, my little baby Avalon can now keep up with the big boys!!  It's like getting a free S3.  =)  Not sure how hot it will run in the summer, makes me uneasy that it's running this hot already when my garage is  just at 76F.

P.S I tried the 4 x 2KW IBM PSU sideways stacked on top of each other.  I don't think this is a good configuration unless you put the PSU at the of end the RACK and vent it to the outside, otherwise it will make all the equipment next to it very hot.  This may be less of an issue if you have box fans blowing from behind but I think it's better to have the hot air go up instead.  This will also help keep the FANs more secure with just using the Scotch Tapes.  Also it's been almost 2 days that I'm rocking the 3 x S7 using the 4K bundle at 731M without any issues.  Looks this this 4K bundle is the real deal.  Just ordered a bunch more 4K cards.


Update -  I noticed that when FAN is set to 60%, the average drop to 3780 or 3800  from 3850 plus when fan is at 50%.  Are others seeing similar results?  This is after the unit have been running for at least 20mins

That looks like the Houston highway map.  So basically above 75 is not ideal based on the info above. I will keep that in mind.

No problem! 2 of these along with your dual breakout board is probably the best way to power miners today IMO. Could even make it a 5000w setup with your board using DPS2500 instead, and get slightly better efficiency to boot.

I am looking for a link to the dps2500 I would be willing to test it here.

http://www.ebay.com/itm/IBM-BladeCenter-DPS-2500BB-2320W-Power-Supply-Unit-39Y7400-39Y7405-/172011963911?

this seems to be it .

I am looking for a link to the dps2500 I would be willing to test it here.

http://www.ebay.com/itm/IBM-BladeCenter-DPS-2500BB-2320W-Power-Supply-Unit-39Y7400-39Y7405-/172011963911?

this seems to be it .

Wow how much have you spend on power supplies so far testing them?  Thanks for doing this.  Also if you love the 2500's and feel like dumping the 2000's let me know.  :D

Hi Phil,

That's the one. I have one too many DPS2500BB and I was looking to get rid of it. I'd happily sell it to you instead of listing it. I'll beat that price on eBay by a bit, and you get a known good PSU. I ran it loaded at 2200W DC for a week and a half to stress test it when I received it. Could have it shipped out to you as soon as tomorrow. Let me know. :)

Do you know that the dual boards work with it?

The board have more than enough copper thickness and layers to handle 5kw.
But it seems external voltage adjust doesn't work on the 2500BB. I still need to try on the ones I have.

Phil,
Very nice to come out ahead!  As usual I missed the boat on the DPS-2000 on ebay.  It seems the prices have shot up so I'm assuming a lot of them were bought up and supply is low now.

dmwardjr,
Nice setup!

Phil,
Very nice to come out ahead!  As usual I missed the boat on the DPS-2000 on ebay.  It seems the prices have shot up so I'm assuming a lot of them were bought up and supply is low now.

dmwardjr,
Nice setup!

GeneralT - You just need to check back often for new supply.  I bought the last 16 IBM 2KW PSU for $20-35 shipped.  The higher price was for the lower rev versions I'm chasing. 

P.S I've ordered over 200 cables from Holybitcoins and Finksy along with 8 breakout boards.  I must say the Quality Finksy / J4bberwock does is extraordinary.  I'm still powering things up now but so far I've connected over 50% of the component and have yet to find 1 bad cable or port.  Very Very happy with the quality of the product.  My EVGA G2 1300W right now are just on standby, the IBM 2KW PSU are pretty nice.

Which 2000bb are early and which are the later revisions.  What I really want to know is if all the revisions have the pot under the hood to adjust the voltage...thanks

The dual 2000/4000 with the three voltage settings say 11.8. 12. 2 12.8

Are really good pretty quiet they do 4 avalon6s at medium volts. Setting .

Once I clean up the den and garage I will be running 3 at high volts .

phillipma1957 - what revision 2000 PSUs do you have? I have duals from REV1-4 that I'm going to be testing and want to compare the outputs for each REV. Running a dual pair of REV1 and at the highest setting I'm only getting 12.33 on the display. I may just need to tweak the pot as J4bber mentioned on the first page of your thread.

rev 7 ,8

@ generalalt the kilo17 big fan mod was not quite good enough for me. The 2880's would overheat running two avalon6s

I ordered some 90 mm fans from superbiiz bgears b-blaster  going to demo it if it allow me to run the 2880 at 90% loads

Some new info on the avalon6 .. I burnt a board  due to high voltage.

I suggest that your psu does not supply over 12.5 and when it is read on the gui 12.2 or under.

@ generalalt the kilo17 big fan mod was not quite good enough for me. The 2880's would overheat running two avalon6s

I ordered some 90 mm fans from superbiiz bgears b-blaster  going to demo it if it allow me to run the 2880 at 90% loads

I have a question about the 4k dual PSU setup.  I was wondering if the fan or fans ever fail for any reason, is there some sort of thermal shutdown for the DPS-2000BB?

Looking forward to that review as well.  2 90mm fans sound like a better fit for me as well since I only have 2 2880.

Wow sucks about burning out that board too.  Sorry to hear that.

Yes, they have thermal protection along with all other possible protections. No need to worry.

missed that you have 2880's

I got a solid mod  with these 2 fans.

http://www.newegg.com/Product/Product.aspx?Item=N82E16835132021&cm_re=bgears-_-35-132-021-_-Product

and these grills

http://www.ebay.com/itm/New-Bgears-BG01381-90mm-Fan-Filter-2-Pack-/381409454959?hash=item58cdc66b6f:g:3igAAOSwiLdV~hr9


I will post the mod.  really works well  I am pulling 10 amps on my 2980  and noise is way down.

Thanks Prelude that makes me feel a  lot better.



Nice Phil.  I just ordered a pair of the DPS-2000BB PSU and a pair of the Scythe fans.  I'm just waiting for everything to come in now. 

I assume the 2880 has thermal shutdown safety as well before I try the 90mm fan mod.

YES THEY Will shut down .

The large white 180mm quiet fan let my 2980s and my 2880s over heat.  they cam right back with the stock fans. So I ordered 2x 90mm fans they work well but I crack a blade on one  My fault. So I am waiting for a replacement before I post the setup.

Perfect thanks!  Well perfect that they shut down when it gets too hot.  Not so perfect about your fan but at least those 90mm fans are relatively cheap.  I'm assuming you have them set to push air into the psus.

the 90mms are 22 with grills  they burn 25 watts vs 60 watts and they are not anywhere as loud as the 3pack oem screaming deltas.

How do you power the 90mm fans?  A separate PSU or do they attach directly to one of the plugs from the stock fans?  I know kilo plugged the two wires from the 180mm fan to a PCIe.

they could use the plugs in the unit but you would need to cut an end off one of the fans .

I just used a pcie with bare wires it was plugged into the breakout board.  two fans are under 25 watts the stock fans are 60 watts

Can you include that in your pics when you're ready to post them please.  I'm not good when it comes to splicing wires and stuff.  Thanks again for sharing your knowledge.