Those flexible adapters are not really working at the moment. Put 4 cards right on the mb and it works.

It's drawing ~1050w doing 4 cards at 2wu's/gpu only. gpu usage is 90%.

Jon

4 of those things is still a beast. How are your temperatures doing?

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Janice

Temps of the gpu are in the upper 70's. cpu is 60. Tomorrow i'll put it in a different room, under the a/c vent to cool it off!

Jon

Temps of the gpu are in the upper 70's. cpu is 60. Tomorrow i'll put it in a different room, under the a/c vent to cool it off!

Jon

But you've got a Hell of a Crucher and can heat a (small) room, too, ;-)

I've often wondered, why PSU cables are so small/thin, compaired to the mains cable, which carries 1/10 of the Input-current, although most PSU's > 650Watt have 4x 12V @ 17-20A. (When in the U.S.A and have 120Volts)
Still 2.5x main-current , while cables are mostly thinner then their mains supply. Not to mention connectors/splitters/switches.
(You can welt with a 100 Amps!)

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Good to see you making progress with your rig Jon, must admit it certainly grabbed my attention! Can i ask why do you think the riser cables did not work or are they ok now?
Best of luck

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Here is it. Looks like pin #3 was the problem.



Jon

Well I won't buy one of them, seems they didn't even need the extra wires could have made a strait adapter with just the Black and green jumpered off and it would be safer. Think I will stick to my home made jumper.

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Official Abuser of Boinc Buttons...
And no good credit hound!

Probably a cheap connector that was loose. Doubt it was the wire....

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Official Abuser of Boinc Buttons...
And no good credit hound!

Probably a cheap connector that was loose. Doubt it was the wire....

Agreed. The heat was apparently strongest right where the pin goes into the socket. Could be a poor fit, or foreign material trapped in the interface, or some manufacturing defect that resulted in only a very small contact area between the pin and socket.

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Good to see you making progress with your rig Jon, must admit it certainly grabbed my attention! Can i ask why do you think the riser cables did not work or are they ok now?
Best of luck

I tested one when i got them, the only good one. I found out that 2 of the 3 adapters were bad! I have more coming so I'll continue to go ahead with this project.

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Jon

FWIW, the battery connectors on a lot of hobby-level radio control cars are similar in design to the ATX mobo connector("Molex" in PC lingo, "Tamiya" in RC lingo).

The RC guys hate the "Tamiya" connector because it melts under high-current applications. This may be what's happening.

As to when someone mentioned above that 0V/ground carries no current, that should be rephrased to "SHOULD carry no current." You can get awful ground loops that destroy things if you muck around too much with multiple ground planes (i.e. more than one power supply). Personally, I'd be looking for an adapter that does something to tie together the grounds of these PSUs (obviously without making them fight each other).

Just my two cents. By the way, this thing is terrifying (and awesome).

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I theenk you need a beeger box

re: grounds..

It should be okay to strap the two power supply grounds, as long as they are not providing any shielding. Also be sure both units run from the same potential(same side of the circuit breaker panel) otherwise strange and sparky things could happen.

That grounding may be common to the case anyway. You should be in good shape.

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Janice

I decided to stay with only 4 cards. I fixed the problem with adapters(sloppy soldering). The 5th card will work but only lasts for a few minutes and you might get a few wu errors. Maybe it's Windows or maybe motherboards are not ready for 5-480 cards!

Jon

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Jon