Antminer S5 - Underclock - Undervolt - Best J/GH

[RichBC]

I have found a 636 watt psu  88% efficient but costly at 128 usd.

I have 2 s-7's on order and I have one of these psu's on order


http://www.onlinecomponents.com/datasheet/hrp60012.aspx?p=37810156

model is Mean Well HRP-600-12 

adjusts 10.2 to 13.8  88% eff

I even found the absolutely best possible psu but it cost even more


http://www.onlinecomponents.com/mean-well-hlg600h12a.html?p=45585982


http://www.onlinecomponents.com/datasheet/hlg600h12a.aspx?p=45585982

HLG-600H-12A

note that A means it has a pot adjustment  10.2 to 12.6

this is 92% eff with no fan!  but it is 198 usd and is only 480watts

It does allow for a quieter miner but is too pricey.

With the cheap model HRP-600-12  I get up to 636 watts.

I will find a freq that allows me to run at 600 watts and 2400 gh.  say 150 vs 300

I will test it with the evga 1600 p2 making sure I am doing around 600 watts I will remove it

I will then use the meanwell  and once it fires up at freq 150 2400gh  600 watts 12 volts.

 I will back the pot down to 10.8  we should get a good watt drop off and the machine should run well.  maybe 500 watts for 2400 gh

I will then know if the s-7 has lower watt then rated.

Will be very interested in how you get on. I can run my S5 at the default 350MHz on 11V with no HW errors with a good saving. The HLG-600H series looks very nice, with high efficiency, no fan and a good range of adjustment, pity it's so expensive.

Rich

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[QuintLeo]

Per the specs on the S7, it might not be ABLE to undervolt - and almost definitely won't undervolt to the point a single 600ish Watt PS will run it.
UnderCLOCK might get there, can't hurt to try it.
 I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.


 Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.

[philipma1957]

Per the specs on the S7, it might not be ABLE to undervolt - and almost definitely won't undervolt to the point a single 600ish Watt PS will run it.
UnderCLOCK might get there, can't hurt to try it.
 I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.


 Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.

you don't understand my goals.   

sound is my issue.  I have a 2.4 cent location  but I need quiet gear there.


which means fans need to be swapped.  power needs to be cut. I also need to find bottom voltage. For longer use.

The net is difficult to explain in detail as  people do not like to read long posts.

BTW if I am correct this machine can do 0.20 watts or maybe 0.18 watts  if so   then a 636 watt psu will allow  a down clock to 3000gh.

I will have a close to silent s-7 that is more efficient then any other piece of gear on the market.

At 2.4 cents and 0.18 watts  this gear will survive the ½ ing

[flikflak]

perfect, so here is the "flip the penny twice" thread. Im getting @ 11.1V ~0.48 - 0.47J/Gh and I always tought it is a good result. So there is even more in it.
The only adjstable PSU (10.2-13.8V) with 88% efficiency I saw, was a Meanwell HRP-600.

[philipma1957]

perfect, so here is the "flip the penny twice" thread. Im getting @ 11.1V ~0.48 - 0.47J/Gh and I always tought it is a good result. So there is even more in it.

yes there is  now if you can find these  2 psu at a good price even better

[flikflak]

Well, I dont think so (saw it for $240 and just thought "no way") so, 128USD is really good.

My 700W Server PSU (HP G5 412211-001) has a pot for voltage adjustment, but it adjusts between 12.6 - 12.004 V - it keeps the 12V under load. Even having a pot on a PSU doesnt imply the opportunity for a propper adjustment rate. So in my case it couldnt be worse.

[RichBC]

Doing a general search on the net and ebay Meanwell have a very big range of PSU's. Quite a lot of them show adjustment from 10 or 10.2 Volts. They seem to have a good name in the PSU World and there are good data sheets on them, so definitely a cut above your average Chinese PSU manufacturer.

There are so many available that I need to spend a bit of time researching them carefully but will probably then buy one. The other "idea" I am considering is 2 x 5V PSU's in series if I can find a couple at a good price to play with. They typically have adjustment from 4.5V to 5.5V which then gives an almost ideal 9V to 11V range.

My only concern with all the Meanwell supplies is that the efficiency is typically under 85% to 88% so not up tere with a Platinum Server PSU with 95%. Need to do some maths to make sure you are not throwing away too much?


Rich

[VirosaGITS]

If you're losing 10% efficiency by getting those PSUs, why not use the PSUs you already have and use a good volt step down at 95-98% efficiency? Depending on what you have on hand it would be more efficient and more effective?

[RichBC]

If you're losing 10% efficiency by getting those PSUs, why not use the PSUs you already have and use a good volt step down at 95-98% efficiency? Depending on what you have on hand it would be more efficient and more effective?

This is one of the several other options I am considering. Top of the list would be to be able to adjust down a Platinum 95% Server. Weather a lower efficiency adjustable PSU is better than a VRM on the output of a Platinum PSU needs some calcs & measurements to be made. I have ordered a couple of the VRM modules that Phil identified and we will see how those perform when they get here.

Rich

[elrippo]

Nice modding around here guys 
I just got me an adjustable PSU and let the games begin 

[philipma1957]

If you're losing 10% efficiency by getting those PSUs, why not use the PSUs you already have and use a good volt step down at 95-98% efficiency? Depending on what you have on hand it would be more efficient and more effective?

This is one of the several other options I am considering. Top of the list would be to be able to adjust down a Platinum 95% Server. Weather a lower efficiency adjustable PSU is better than a VRM on the output of a Platinum PSU needs some calcs & measurements to be made. I have ordered a couple of the VRM modules that Phil identified and we will see how those perform when they get here.

Rich

well one of the meanwells is 92%  the other is 88%

of course the 92% is the more expensive  choice  198 usd for 1 and 170 usd for 10

note the A at the end of the model is the pot  adjustment model

http://www.trcelectronics.com/View/Mean-Well/HLG-600H-12A.shtml

https://www.trcelectronics.com/ecomm/pdf/hlg600h.pdf



the cheaper one is 88%

 121 usd  for 1 108 usd  for 9

http://www.trcelectronics.com/View/Mean-Well/HRP-600-12.shtml

https://www.trcelectronics.com/ecomm/pdf/hrp600.pdf


The 92% is fanless and maxes at 480 watts 24/7/365   but I would think a fan lets it run with a bit more power.

I purchased the 88%.

  It arrives next weds  I am waiting on the s-7's

I will try to run 2 blades of the 3 under volts and under freq
I will try to run 3 blades of the 3 under volts and under freq.

If I lower the power to 600 watts and get .18 watts a gh

I am at 3333gh

The gear will be quiet.-------------really big for me

and at .18 per gh I am ahead of the field

If it does not work I only spent 128 with the shipping to find out.

[SLEI]

I have used HP DPS-600 server powers on S5s upto 400mhz and they have been running 381mhz for months now.
0.001% error rate at 381mhz, powers are 47A but seems to work over specs and are dirty cheap from Ebay.
I have tested them with outboard trimpot and they can adjust to 10.5V. I haven't feed low voltage to the miners yet.
DPS-600 have a current share port so at least 2 can work parallel on S7 maybe.
 

[RichBC]

I have tested them with outboard trimpot and they can adjust to 10.5V. I haven't feed low voltage to the miners yet.

Where did you connect the trimpot?

[elrippo]

Per the specs on the S7, it might not be ABLE to undervolt - and almost definitely won't undervolt to the point a single 600ish Watt PS will run it.
UnderCLOCK might get there, can't hurt to try it.
 I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.


 Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.

you don't understand my goals.   

sound is my issue.  I have a 2.4 cent location  but I need quiet gear there.


which means fans need to be swapped.  power needs to be cut. I also need to find bottom voltage. For longer use.

The net is difficult to explain in detail as  people do not like to read long posts.

BTW if I am correct this machine can do 0.20 watts or maybe 0.18 watts  if so   then a 636 watt psu will allow  a down clock to 3000gh.

I will have a close to silent s-7 that is more efficient then any other piece of gear on the market.

At 2.4 cents and 0.18 watts  this gear will survive the ½ ing

Hey Phil, is your location taking other peoples hardware also? I would be glad if my Hardware would be hosted in such a location, since here in EU i pay 20€ cents for the KW/h...

[RichBC]

I have tested them with outboard trimpot and they can adjust to 10.5V. I haven't feed low voltage to the miners yet.

Where did you connect the trimpot?

OK I had a couple of HP DPS-600 PSU's as I had bought them because they were reported as being adjustable. The ones I have are marked Series ESP135 Model PS-3601-1C but are reported on the Net as being the same. They have the same HP Spares number 338022-001.

I tried the voltage reduction pot when I first got them, 5K pot from (-12V to the Voltage input pin) but it resulted in almost no adjustment and then the PSU went bang... So I put it to one side and got on with other things.

So this Morning tried the second DPS-600 and it works fine. I can adjust from 12.3V down to 10.6V. I suspect it would go further with a greater -ve voltage? What went wrong with the first one we will never know?

So I will give the PSU a try on the S5 and see if it can deliver the current when the voltage is reduced? If it does the only snag I can see is that they are reported to be only 81% efficient and presumably that is at 12V, so may be worse at a lower voltage? This could throw away a lot of the gain, so will have to make some measurements.

Rich

[SLEI]

From ultimaterc.com :

"Or use a single 2k-10k pot with the outer legs tied to pins 3 and 5 and the center wiper to pin 9 for voltage adjustment above and below 12v. "

I tested 10k trimpot which I used for S1 undervolting and got 10.5-13.8V until over and under protection kicked in.

DPS-600 goes little over specs with overclocked S5 but I have used them 24/7 since I got my first or second batch S5.

ESP135 has slow speed fan connected  at factory otherwise specs are same, fan is auto adjusted to temperature, but some modells start at full speed if You don't connect pin 4 to ground .

[RichBC]

Yes I saw that you could connect the pot such that you can go over & under Voltage, but have no need to increase the voltage so just put it between 5 & 9. Do you find that when you turn the volts down, with no load on the PSU, the fan speed increases?

Rich

[SLEI]

I only tested volt limits I didn't make any other testing.

Power usage from wall was 700W with 381Mhz S5.

[VirosaGITS]

It seem to me Bitmain are trying to make their miners NOT undervoltable, basically unhackable. S1 pen moddable, then S3 no longer, then S4's volt control get disable in later firmware, etc.

Maybe we can find a way to crack the S5, but if they do, they might "patch it" next time... maybe keep the good solutions under wrap?

[RichBC]

It seem to me Bitmain are trying to make their miners NOT undervoltable, basically unhackable. S1 pen moddable, then S3 no longer, then S4's volt control get disable in later firmware, etc.

Maybe we can find a way to crack the S5, but if they do, they might "patch it" next time... maybe keep the good solutions under wrap?

I agree that Bitmain seems to be making it more difficult to undervolt than they could. It is unclear to me if this is driven by cost reduction and simplifying support, or if it is driven by a deliberate strategy to have miners become uneconomic sooner than they could?

However as a hack I think it was and will continue to be possible. S1 yes easy to undervolt with either the Pencil Mod or a resistor change. S3 no change only a simple resistor change needed. S4 designed with undervolting built into the firmware, but as you say later removed. Still unclear why this was done, however from a hack point of view you just use the old firmware.

So moving on we now have the miners with a string supply. Also let's remember that they initially told us with the S5 that with a 9V supply you would see 0.2J/TH. This was later removed however my current theory is that the initial design was flawed and when the voltage to the string was reduced the string stopped hashing. On the latest revision of the hash board V1.91 they have made a change to add an oscillator for every  4 chips in the chain, and this "seems" to allow undervolting.

If we now look at the S5+ and the S7, which I have only seen pictures of, there appear to be oscillators for every stage of the chain. So, yet to be proven? I think that they will both undervolt.

The efficiency gain you can get with undervolting is however reducing as they push the factory release of the product less hard. S1 could be doubled, S3 and S5 each less and the S7 has been released with the chip core voltage at the mid point, however still gains to be had.

So undervolting may not be as simple as the pencil mod and Bitmain may not be encouraging it. However I do not think they are deliberately making it difficult, they are just not spending any money on making it easy.  

Rich