If China doesn't work out for you I can make what you need. I am in the US though. See sig for marketplace.
Topic: Specs on BFL Single power adapter? (Read 13018 times)
@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.
If China doesn't work out for you I can make what you need. I am in the US though. See sig for marketplace.
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).
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.
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.
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.
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?
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?
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.
http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress
Please note that each yellow wire must be able to provide 70Watts
of power (that's around 5.83A per wire)
of power (that's around 5.83A per wire)
http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress
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://bitcointalksearch.org/topic/wts-atx-psu-to-25-or-2155mm-12v-coaxial-plug-power-cables-new-product-74397
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).
I am set up here to make fully custom cables if you BFL single owners are interested. See here for cables: https://bitcointalksearch.org/topic/wts-atx-psu-to-25-or-2155mm-12v-coaxial-plug-power-cables-new-product-74397
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).
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.
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?
Selling some connectors here:
https://bitcointalksearch.org/topic/wts-atx-psu-12v5v-peripheral-cables-73576
https://bitcointalksearch.org/topic/wts-atx-psu-12v5v-peripheral-cables-73576
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.
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.
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. 
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.
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-NDBut 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.
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?
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.
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.
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?
The cost of the equipment being protected. GPU are cheaper and use more power which means a UPS will be more expensive and a higher % of total system cost. An FPGA is more expensive and uses less power which means a UPS will be less expensive and a lower % of total system cost.
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?
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