FOR SALE - D750 750W Server PSU Breakout Boards

[claudesdad]

Still got boards and cables available. We're now shipping the V0.5 boards, which have a better supply-side socket (better more reliable fit) and improved current metering. We're working on PCB design for DPS-2000BB boards and should be prototyping soon. We're also working out a package kit for tying three Z750 supplies together with a single control board with better status LEDs and unified control, that'll allow you to load-balance them together into a single ~2200W unit.

Now that would be slick - controlling three PSU's together.  I'd have to sell off all the boards I've already bought though to convert over to that.

[Bawb3]

I just fired up one of these boards (v0.4 I think?) the other night.

Using one power supply to power 2x R9 290 graphics cards, it works beautifully!
The cards fired right up, and have been running rock solid stable for for 2 days now, I love the idea of using server power supplies that are designed to run constantly.

They also answered all of my questions very thoroughly, and quickly, and I have to say it's been a pleasant experience.

I got the power supplies off ebay for 20$ a piece, and the boards were 40$, so 60$ for a reliable 750w power supply, you can't beat it.
The only additional expense was purchasing PCIe extension cables and some 16awg wire, which I hacked into the necessary connectors for the cards.

The one I'm testing runs 2x 290's with ease, they *might* handle 3 cards, but I don't think I'll risk overloading the PSU.
According to GPU-z each card draws 250-275 watts @ 20-25 amps depending on level of overclock, and how hard the fans are running. However I have no way of telling how accurate that is.

[sidehack]

Now that would be slick - controlling three PSU's together.  I'd have to sell off all the boards I've already bought though to convert over to that.

False. The three-way board would use the IO headers on existing boards. And all future boards are being designed pin- and signal-compatible, so you could use three DPS-2000BB boards or three DPS-800 boards when those are available, or any past or future revision D750 board.


Also, Bawb3 - it's too bad you don't have V0.5 boards, because the V0.4 boards' internal current meter isn't accurate (reads high) or you could get a good measure on how much power the cards are actually eating. For the V0.5 board, 1.8V on the CUR pin should correspond to 60A. I'd say if your V0.4 board's CUR pin reads 1.2V or less, you're at less than 2/3 capacity and it should be safe to add a third card. Should be, no guarantees.

I've got one of these boards powering a 7870 Eyefinity 6 on my workbench right now, been running for probably approaching a month with no issues at all. Are you using the EON pin to turn the supply on, or manual toggle switch?

[AbiTxGroup]

Sidehack, Could you check your email.  I am looking for tracking info for my order this past Friday.

[claudesdad]

Now that would be slick - controlling three PSU's together.  I'd have to sell off all the boards I've already bought though to convert over to that.

False. The three-way board would use the IO headers on existing boards. And all future boards are being designed pin- and signal-compatible, so you could use three DPS-2000BB boards or three DPS-800 boards when those are available, or any past or future revision D750 board.


Also, Bawb3 - it's too bad you don't have V0.5 boards, because the V0.4 boards' internal current meter isn't accurate (reads high) or you could get a good measure on how much power the cards are actually eating. For the V0.5 board, 1.8V on the CUR pin should correspond to 60A. I'd say if your V0.4 board's CUR pin reads 1.2V or less, you're at less than 2/3 capacity and it should be safe to add a third card. Should be, no guarantees.

I've got one of these boards powering a 7870 Eyefinity 6 on my workbench right now, been running for probably approaching a month with no issues at all. Are you using the EON pin to turn the supply on, or manual toggle switch?

Ahhh - excellent.  Even cooler.

One of my concerns going forward though - is if I'll even be using this setup (Dell supplies and Geckoscience boards) - going forward.

Most of the TH level mining units that are coming out seem to be coming with their own supplies. So when (if) - I move up to something else the separate PSU's will get retired along with the S1's.

[sidehack]

I wonder if the internal supplies are 90% efficient? Hopefully the guys making them, especially since they're gonna be charging serious bank, put the best supplies in that they could find.

[philipma1957]

I wonder if the internal supplies are 90% efficient? Hopefully the guys making them, especially since they're gonna be charging serious bank, put the best supplies in that they could find.

   The s-2's  will use enermax gold 1000 watt supply. It is a good psu, but it will pull 840-880 watts non stop 24/7/365  frankly that makes me nervous to do that on a 1000 watt psu.

I may be able to find a review. I think it will not do 90%  more like 86- 87%  due to the high watts used to watts capacity.

We Have to wait until they are shipped and reviewed to be sure that it is the enermax 1000 watt gold.


http://www.amazon.com/Enermax-Revolution87-Certified-Supply-ERV1000EWT-G/dp/B0076NR822


http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=270   this review thinks it will do about 87 percent

[sidehack]

880W at the wall for an 86% PSU is an output power of about 760W. The same from a 90% is a wall consumption of 840W. That difference, not even considering the potential failure/replacement expense, is pushing $33 a year in extra electric at my rates, which are some of the cheapest in the country.

Unless that was 880W output, which at 86% is 1020W at the wall. 880W output at 90% is about 980W, close enough to the same difference for these calculations, but 880W continuous from a 1000W consumer-grade supply definitely greatly increases your odds of failure.

I wonder how hard it'd be to jack a DPS-800 into it instead? Running off 220V that'd handle the load pretty easily.

[philipma1957]

880W at the wall for an 86% PSU is an output power of about 760W. The same from a 90% is a wall consumption of 840W. That difference, not even considering the potential failure/replacement expense, is pushing $33 a year in extra electric at my rates, which are some of the cheapest in the country.

Unless that was 880W output, which at 86% is 1020W at the wall. 880W output at 90% is about 980W, close enough to the same difference for these calculations, but 880W continuous from a 1000W consumer-grade supply definitely greatly increases your odds of failure.

I wonder how hard it'd be to jack a DPS-800 into it instead? Running off 220V that'd handle the load pretty easily.

found a review.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=270    


 I think this is okay to run 2 s-1's  at 720 watts 24/7/365  

  but 2  modded dells are under 160-170  and this is over 200.  and the  2 dells will do 3 s-1's over clocked to 200gh at freq 393 or 400

   my guess is  people will have problems with this enermax if it is what is supplied with the s-2

[sidehack]

Wow, that review page really likes animated banner ads.

[AbiTxGroup]

Sidehack, Could you check your email.  I am looking for tracking info for my order this past Friday.

LOL.  Seen you were on the forums and sent you another email.  Now, just as I was getting ready to leave the building to go to a customers site, the postman caught up to me with my order.  I see a little bitmain happening here.....receiving the package before the tracking info is sent.   

Any way, since I posted the above post here, I thought that I should show that I did receive another order from you.

Thanks.

I will add a little positive trade for you.

[sidehack]

Nifty. I'm actually not fielding customer emails on this round, but the guy in charge of handling shipping stuff sorta pulled an all-nighter on other tasks (he was still here at 8AM) so he might not have gotten to your emails. Tracking numbers are getting entered in the order database, but we haven't automated tracking customer emails yet. That's probably going to be implemented soon.

[daddyfatsax]

Nifty. I'm actually not fielding customer emails on this round, but the guy in charge of handling shipping stuff sorta pulled an all-nighter on other tasks (he was still here at 8AM) so he might not have gotten to your emails. Tracking numbers are getting entered in the order database, but we haven't automated tracking customer emails yet. That's probably going to be implemented soon.

I ordered last Thursday, I think, and my full kit arrived Monday. No complaints here, just a nice surprise when I got off work.

[h@shKraker]

Sidehack,

Speaking of DPS-800 PSUs how are your controller boards for those PSUs coming along?  I happen to currently have good access to DPS-800 units and I'd like to put them to work.  Hope all is well.

H@shKraker

[sidehack]

I could start making them pretty soon if I didn't care about load-balancing. If I've done all my checking correctly, it's going to require an external circuit to implement load sharing and I haven't had time to prototype the design that I have figured out for that particular problem. Hopefully I can do that soon.

[h@shKraker]

Sidehack,

Coolio sir.  Soooo you're saying I *SHOULD* go ahead and stock up on those PSUs because you for sure will have models for DPS-800 supplies .... right??

H@shKraker

[sidehack]

I'm thinking I might just not worry about loadbalancing. Not sure a lot of people are really using it anyway... I'll see what I can do about getting some DPS-800 boards out in the next few weeks to a month.

[qosmio]

i got 4 of them for 20 usd each shipping included very nice but loud like a vacuum cleaner

[sidehack]

The Z750 supplies? My board has fan speed so you can quiet them down substantially.

[claudesdad]

I'm thinking I might just not worry about loadbalancing. Not sure a lot of people are really using it anyway... I'll see what I can do about getting some DPS-800 boards out in the next few weeks to a month.

Keep in mind - this is just my opinion, (and I'm probably biased because I have a bunch of the Dell 2950 supplies):

If I search on Ebay for DPS-800 power supply I come up with about 113 hits.  If I search on Ebay for Dell 2950 power supply - I get about 300 hits.

So the amount of Dell 2950 supplies out there available seems to roughly be double the amount of the DPS-800 supplies.

Now I've already bought a bunch of your existing boards for the Dell supplies - and my original plan was to use the supplies in "clusters" - so that I'd have multiple supplies powering multiple S1 Antminers.  I was going to do like 4 or 5 supplies - to power 3 Antminers.  I figured that would allow me redundancy - AND still be able to keep the fans turning very low on the PSU's to keep the noise down.

So from my perspective at least - a more "full featured" product - where the load balancing is built in - and where the fan speed control works properly across all the different rev numbers of the Dell 2950 supplies - is more important than coming out with a board to support another different power supply.

So the predicament you're in now is the classic one that pretty much everybody who builds a product comes into:  make the existing product better and add features - or - make another product to serve a different market.

Everybody only has so much time and energy - you've just got to decide where to spend  yours.

The other thing to bear in mind is:  what's your market?  Right now  you're selling these to people who are powering Bitcoin miners.  The days of the independently powered Bitcoin miner seem to be numbered , seeing as how a lot of the high hash rate units that are coming out are now coming with their own supplies.  Combine that with the recent IRS ruling - and the dump in the Bitcoin price today, and I'd even start to wonder about Bitcoin mining itself.

There's probably other markets for these boards: test labs, battery chargers? - I don't know.  So you might want to think about what would sell better,  a more fully featured Dell 2950 board - or a board for a different supply.

Just my .0002 BTC.