Specs on BFL Single power adapter? - page 2.

Inaba

legendary

Activity: 1260

Merit: 1000

Quote from: DeathAndTaxes on March 19, 2012, 05:52:24 PM

Quote from: Inaba on March 19, 2012, 05:48:36 PM

I have trouble finding high enough capacity UPS units that don't cost more than it's worth to protect, though...

For GPUs I agree but he is talking about ztex FPGAs. At $250 per board (even in bulk) and 8W it is roughly $31 per watt. One can get a UPS for 1% of total system cost. Sounds like a good investment to me.

Now GPUs I wouldn't consider a UPS.

I'm not sure I see how that matters, if he's loading down a 1200w PSU with 125 Zetex or 14 BFL units, the load is the same to the UPS. Am I missing something?

rjk

sr. member

Activity: 448

Merit: 250

1ngldh

The internal protection in a PSU will not allow the output voltage to go out of spec, I.E., it will never be above or below its rated output. Therefore a "brownout" cannot happen on the 12v side, but such an event on the input will simply cause a shutdown.

rjk

sr. member

Activity: 448

Merit: 250

1ngldh

Quote from: DeathAndTaxes on March 19, 2012, 05:19:24 PM

I have never seen a high quality PSU kill downstream components unless abused or pushed beyond specs. Honestly I haven't ever heard of any ATX PSU damaging components that wasn't related to user error or abuse.

+1, also insurance.

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Quote from: Inaba on March 19, 2012, 05:48:36 PM

I have trouble finding high enough capacity UPS units that don't cost more than it's worth to protect, though...

For GPUs I agree but he is talking about ztex FPGAs. At $250 per board (even in bulk) and 8W it is roughly $31 per watt. One can get a UPS for 1% of total system cost. Sounds like a good investment to me.

Now GPUs I wouldn't consider a UPS.

Inaba

legendary

Activity: 1260

Merit: 1000

I have trouble finding high enough capacity UPS units that don't cost more than it's worth to protect, though...

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

I have never seen a high quality PSU kill downstream components unless abused or pushed beyond specs. Honestly I haven't ever heard of any ATX PSU damaging components that wasn't related to user error or abuse.

In our datacenter we have $80,000 servers running 24/7/365 off power supplies (n+1 redundant). Power supplies are designed to safely power a lot more than a couple thousand in FPGAs. Your UPS idea is dubious. What if it is the UPS not the PSU which fails? Plus UPS don't really exist for DC loads at the price point you are looking at. So you are talking about some kind of modding increasing the risk of failure.

Anything can happen but internal PSU failure that also protected downstream components is very remote. If you really feel the need for supplemental protection get:
a) whole house surge arrestor (a real one) <- still won't help in a direct strike hopefully your mains are underground
b) a dedicated circuit and outlet preferably with a locking connector to prevent accidental disconnection
c) line interactive UPS

the goal being to ensure the power into the PSU is perfectly clean. Transients from upstream of the PSU are far more likely to cause damage than a failure of a PSU which results in internal unsafe voltage.

P_Shep

legendary

Activity: 1795

Merit: 1208

This is not OK.

ATX PSU's *should* fail safely... you've had one take out components too? Shocked

P_Shep

legendary

Activity: 1795

Merit: 1208

This is not OK.

Can see them here (as posted in the rigs thread!):

Using the 12v and 5v from the 4-pin peripheral connector to power the router and hub respectively.

All I need now is for my singles to arrive.

*twiddles thumbs*

*whistles*

*Scratches butt*

When they do, I'll have a nice ~5Gh/s 'rig' which can be plugged into any socket, pretty much anywhere - just need a wifi connection

P_Shep

legendary

Activity: 1795

Merit: 1208

This is not OK.

Quote from: DeathAndTaxes on March 19, 2012, 04:49:00 PM

Looks nice P_shep but how is that 4x1 adapter wired?

Just wired to each of the 4 pairs as you would expect.

The 6-pin PCI-E has just 2 wired to the outer pairs.

rjk

sr. member

Activity: 448

Merit: 250

1ngldh

Quote from: P_Shep on March 19, 2012, 04:45:07 PM

I made a few for myself. Will have a few more to sell when I get round to soldering them.

https://i.imgur.com/j2pjE.jpg

Very nice. I never considered using the EPS12V connector, because you could use it for a host system such as a cheap atom or VIA based mini-ITX board. And, if you are powering FPGAs other than BFL, you could even use one of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16812198016 for a total of 12 6 FPGA per 6-pin connector. (edit, brain dead, said 12 meant 6)

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Looks nice P_shep but how is that 4x1 adapter wired?

P_Shep

legendary

Activity: 1795

Merit: 1208

This is not OK.

I made a few for myself. Will have a few more to sell when I get round to soldering them.

jamesg

vip

Activity: 1358

Merit: 1000

AKA: gigavps

Quote from: DeathAndTaxes on March 19, 2012, 04:34:20 PM

Quote from: jamesg on March 19, 2012, 04:32:17 PM

Well, I think we can count me out for the moment. Saving 10w on 11 singles 80Kwh for me over the course of a month which amounts to $5.68 or ~1.1 BTC. A month. I was thinking it would be fun to do this, but the cost seems a bit too high with the extra PSU ($220) and adapters ($250).

My money is best utilized elsewhere atm.

The quote was $25 for 3x1 adapters. I won't be ordering them I was hoping they could supply them for $10 and I mark them up to $15.

. Still it wouldn't require 11 adapters to power 11 singles just 4.

I stand corrected.

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Quote from: jamesg on March 19, 2012, 04:32:17 PM

Well, I think we can count me out for the moment. Saving 10w on 11 singles 80Kwh for me over the course of a month which amounts to $5.68 or ~1.1 BTC. A month. I was thinking it would be fun to do this, but the cost seems a bit too high with the extra PSU ($220) and adapters ($250).

My money is best utilized elsewhere atm.

The quote was $25 for a 3x1 adapters. I won't be ordering them as I was hoping they could supply them for $10 and I mark them up to $15.

. At $25 for cost there is no market and no profit for yours truly. Still it wouldn't require 11 adapters to power 11 singles just 4.

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Yeah that was my original thought. Still a lot of work sweatshop work which is why I looked for an OEM. However if you are interested go for it. I am sure there is demand for a product. I would be interested but not @ 4 BTC each.

jamesg

vip

Activity: 1358

Merit: 1000

AKA: gigavps

Well, I think we can count me out for the moment. Saving 10w on 11 singles 80Kwh for me over the course of a month which amounts to $5.68 or ~1.1 BTC. A month. I was thinking it would be fun to do this, but the cost seems a bit too high with the extra PSU ($220) and adapters ($250).

My money is best utilized elsewhere atm.

rjk

sr. member

Activity: 448

Merit: 250

1ngldh

Quote from: DeathAndTaxes on March 19, 2012, 01:41:50 PM

Quote from: Inaba on March 19, 2012, 01:28:56 PM

Yeah, I am not looking forward to that... it is almost tempting to just cut the ends off and do some soldering.

Yeah I am thinking that is the better route for hand assembly. Doing 6 butt splices would be a lot easier than building a cable assembly by hand.

Well hey, I just found this thing:

That would cut the amount of work needed by quite a lot. You would only need to buy barrel adapters, and then there would be no PSU hacking needed. I might even do some, since gigavps offered 4BTC each how does that sound for everyone?

EDIT: This one would allow for 3 BFLs per 6-pin, and if you need some, say how many so I can figure out how much stuff to order.

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Quote from: Inaba on March 19, 2012, 01:28:56 PM

Yeah, I am not looking forward to that... it is almost tempting to just cut the ends off and do some soldering.

Yeah I am thinking that is the better route for hand assembly. Doing 6 butt splices would be a lot easier than building a cable assembly by hand.

Inaba

legendary

Activity: 1260

Merit: 1000

Yeah, I am not looking forward to that... it is almost tempting to just cut the ends off and do some soldering.

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

I have it on my home computer I will post a parts list this evening.

I think partially complete parts lists are floating around in various threads.

The main obstacle is the mind numbing tedium of manually crimping and soldering a couple hundred wires.

Topic: Specs on BFL Single power adapter? - page 2. (Read 13075 times)