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Author Topic: Second PSU Keep Turning Off  (Read 280 times)
MadMatt
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March 01, 2014, 12:17:36 AM
 #1

Hello, before I start I'll post my specs

-970A DS3P MB
-5x Sapphire 7950 3GB Boost
-5x Powered 1x to 16x Risers
-4GB DDR3 Ram
-Sempron 145
-2x http://www.newegg.com/Product/Product.aspx?Item=N82E16817116019 (NOTE: It actually has 2x 8Pin, 2x 6+2 Pin, Newegg and NZXT's website are wrong; this makes me have to use 6x Molex - 6Pin PCIe adapters to power 3x cards)

I have it set up so that PSU #1 powers 2x Cards, 5x Risers, the MB and all the other components. PSU #2 is suppose to power 3x Cards, and nothing else.

It starts up fine and runs good, but when I start hashing, PSU #2 turns off essentially instantly. I tried it so that PSU #2 only had 2x Cards on it, same thing, it powered down instantly. This makes no sense since PSU #1 can power 2x Cards and all the other components, and it gets even weirder, it hashes fine when PSU #2 only has 1x Card hooked up. I also swapped them around, and swapped in a brand new one I had laying around of the same brand / model; same result. I have a feeling it's because it can't handle all the power through the Molex - PCIe adapters?, but PSU #1 is powering one of the cards with 2x Molex, so I'm not exactly sure... Any help would be GREATLY APPRECIATED!!

Things I've tried:
-Swapping PSU's around, and swapping in another - brand new PSU
-Instead of using Add2PSU, I've shorted out the green/black wire to make sure it wasn't a problem with the 2x PSU connector
-I've powered the risers with the same PSU that is powering the cards
-Tried several different combinations of powering the cards / risers

Things I'm going to try:
-Hook up a 850W that has 6x 6Pin PCIe cables once my lease is done on one of my other rigs!

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evansearle42
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March 01, 2014, 01:11:05 AM
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Time for RMA..
MadMatt
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March 01, 2014, 01:41:52 AM
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Indeed, I threw a 750W Gold Thermaltake on it and it's hashing like a beast. I'm gonna keep the one that's powering the MB / 2 Cards though. Seems to be a problem of how it's made and how the power is distributed, not the actual wattage.

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