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Author Topic: Specs on BFL Single power adapter?  (Read 6678 times)
DeathAndTaxes
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March 20, 2012, 01:32:47 AM
 #101

Probably that the loss in efficiency isn't much to worry about when the farm makes so much money during power outage. FWIW, I wouldn't bother with a UPS though, power is never out very long around here.

My thinking was just that since he is overly concerned about the quality of the power a line interactive UPS would ensure a very high quality input AC power.  Near perfect sinewave with the UPS boosting sags and absorbing spikes. 

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March 20, 2012, 01:34:03 AM
 #102

Probably that the loss in efficiency isn't much to worry about when the farm makes so much money during power outage. FWIW, I wouldn't bother with a UPS though, power is never out very long around here.

My thinking was just that since he is overly concerned about the quality of the power a line interactive UPS would ensure a very high quality input AC power.  Near perfect sinewave with the UPS boosting sags and absorbing spikes. 
Ah yes I didn't consider that. A double-conversion UPS would certainly add protection at the cost of some efficiency (not sure how much though).

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March 20, 2012, 01:44:08 AM
 #103

So where to get the barrel connectors cheap?  I may make a bulk order of some 6 pin adapters and would just need to cut those and solder on the barrel connectors.  Anyone got a source?

If you're searching these lines for a point, you've probably missed it.  There was never anything there in the first place.
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March 20, 2012, 01:53:08 AM
 #104

So where to get the barrel connectors cheap?  I may make a bulk order of some 6 pin adapters and would just need to cut those and solder on the barrel connectors.  Anyone got a source?
http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=CP3-002BH-ND
But you might want to order one extender first to make sure it isn't going to be shitty 20 gauge wire.

EDIT: http://www.newegg.com/Product/Product.aspx?Item=N82E16812198016 is a dual splitter for 6 non-BFL (I.E., under 40 watts each) FPGAs per 6-pin, and http://www.newegg.com/Product/Product.aspx?Item=N82E16812123301 is for 3 per 6pin.

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March 20, 2012, 02:02:42 AM
 #105

You sure that OK Gear one is 16ga or better?  One other issue I see is ... is 12" enough to actually run 3 units spread out enough?  Might be kinda tight depending on heat envrionment.

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March 20, 2012, 02:04:37 AM
 #106

You sure that OK Gear one is 16ga or better?
Not sure, that's why I said buy 1 to find out. Might be able to look them up and find a spec sheet, but I doubt it.

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March 20, 2012, 02:17:34 AM
 #107

You sure that OK Gear one is 16ga or better?  One other issue I see is ... is 12" enough to actually run 3 units spread out enough?  Might be kinda tight depending on heat envrionment.

You can always do a double splice

connector ---- butt splice ----- extension wire 2 ft ----- butt splice ---- wire terminated barrel adapter

but the longer the cable the more important it is to have thick wires to avoid voltage drop and the corresponding current / temp increase.

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March 20, 2012, 02:24:01 AM
 #108

You sure that OK Gear one is 16ga or better?  One other issue I see is ... is 12" enough to actually run 3 units spread out enough?  Might be kinda tight depending on heat envrionment.

You can always do a double splice

connector ---- butt splice ----- extension wire 2 ft ----- butt splice ---- wire terminated barrel adapter

but the longer the cable the more important it is to have thick wires to avoid voltage drop and the corresponding current / temp increase.
The reason I mention the size is because ngzhang just recently burnt some such similar extenders when testing Icarus. Not sure how many Icarus he was testing per wire, but it must have been more than 2, cause the connections went brown fairly quickly.

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March 22, 2012, 09:41:25 PM
 #109

Selling some connectors here:

https://bitcointalk.org/index.php?topic=73576.0

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March 24, 2012, 12:29:05 PM
 #110

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



We're you able to make a few of these for sale?
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March 24, 2012, 12:30:38 PM
 #111

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



We're you able to make a few of these for sale?

See the post exactly 1 post before yours.
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March 24, 2012, 01:09:29 PM
 #112

I will be making a custom set of pcie->12v barrel for when my singles arrive.  These will be be custom length, standard connector cables crimped with no butt splices.

I am set up here to make fully custom cables if you BFL single owners are interested.  See here for cables: https://bitcointalk.org/index.php?topic=74397.0

EDIT: Here are the pics of my BFL single cables:

The cables are 35" long with 2.5/5.5mm center +ve barrel plugs at a pitch of 8" for BFL single spacing.
For my needs I have used an EPS12V and a direct to PSU PCIE connector (for simpler management).

 

Tired of messy power bricks in your FPGA or ASIC setup???
Chris' Custom Cablez will get you sorted out right! 
Look Here: https://bitcointalk.org/index.php?topic=74397.0
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April 27, 2012, 04:57:09 AM
 #113

What I really don't understand is how you guys are able to use 1 PCI-e from the PSU to power 3 BFL singles. The three +12V lines are limited to 2.083A each, but the single needs 5.83A.

Please note that each yellow wire must be able to provide 70Watts
of power (that's around 5.83A per wire)

http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress
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April 27, 2012, 05:40:24 AM
 #114

The spec limits it to that but it is an artificial limitation.  The wiring and actual adapter can handle much much more.  Well over 250W.

Just to show you how artificial that limit is.

6 pin connector = 75W max (2.083A per ea of the 3x 12VDC conductors)
8 pin connector = 150W max (4.17A per ea of the 3x 12VDC conductors)

Hmm.  Yeah the two extra pins are simply unloaded grounds.  The device pulls to ground to verify it has a 8 pin connector attached.  All the power is delivered over the same 3 wires.

Now if you look at some PSU they have a pair of connectors on the same set of wires

like this:
psu ---------- adapter #1 ------ adapter #2

but wait the load through adapter #1 is going to be 300W if both adpaters are loaded to spec. 

Starting to get the picture?

Gerald Davis  CEO, Tangible Cryptography Inc.
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April 27, 2012, 12:34:36 PM
 #115

Thanks DeathAndTaxes, very helpful as usual.

I went out and bought a couple of cables/adapters and built a custom cable. The cables are still getting hot, the AWG16 and AWG18 printed on them is probably fake which is nothing unusual in my corner of the world I guess. I already had that suspicion in the shops, the cables are really very thin to be AWG16. But I literally went to dozens of shops and they are more or less all selling the same crap.

The cable that was included with the PSU (real AWG18) doesn't get hot. I use the cable from the PSU and plug my own cable into the plug on the other end. I'd have used my own wiring, but I just couldn't find a dual AWG16 cable. Heading out again tomorrow to buy a roll of AWG16 in red and brown (no yellow/black in stock). Makes it a bit more complicated, since I will have to solder on the connectors which I tried to avoid by buying all the crappy cables above.


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April 27, 2012, 12:38:02 PM
 #116

yeah you will want to make sure they are thick cables.  Best thing to do is cut one of them and measure it with a wire stripper.  In AWG16 setting it should strip only the insulation and none of the strands.  If it doesn't using wire stripper you can find out what gauge they really are.

Gerald Davis  CEO, Tangible Cryptography Inc.
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April 27, 2012, 12:41:16 PM
 #117

Sorry, I was still editing the above post when you replied. I may actually speak to some of these shops about making custom cables, or I go directly to the source in China next week. I'll show them a sample and ask for the price for 100 pieces (with real cables).
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April 27, 2012, 05:56:40 PM
 #118

@antirack - I have made my own 6pin PCIE tri-BFL 16AWG cable similar to my above post and it does not get warm at all with the singles humming away happily.  Be careful with substandard wiring, nothing good will come of it.

If China doesn't work out for you I can make what you need. I am in the US though. See sig for marketplace.  Smiley

Tired of messy power bricks in your FPGA or ASIC setup???
Chris' Custom Cablez will get you sorted out right! 
Look Here: https://bitcointalk.org/index.php?topic=74397.0
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