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Weird PSU problem (corsair HX1000)

post #1 of 15
Thread Starter 
I purchased a Corsair HX1000W power supply earlier this year for GTX 480 SLI. I used to own a Corsair TX750W which I used for a year with no problem.

Anyways so I installed the HX1000 and everything was running fine until I added the second GPU. My computer kept restarting everytime I tried to run a game or as soon as the GPU were under load. The screen would just go black and then the PC would restart. I tested the GPUs separately and they caused no problem at all. So then I tried my old Corsair TX750W PSU with the 2 cards in SLI and everything worked fine again. So all fingers pointed to the PSU being the problem. So I decided to give the HX1000W one last try and surprisingly, it worked flawlessly....?

It worked for about a month and half until I removed GPU#2 and decided to have only 1 GPU in my rig. The black screen and restart problem started happening again. So I decided to test my old TX750 out again and everything worked fine. I then put the HX1000W back in my rig and everything worked fine...

And now after a few days, the black screen and restart is happening again everytime the GPU is under load. I currently still have only 1 GPU in my rig at the moment... what is going on??

Also another thing I should mention, it is definitely not a temperature issue. Both my cards, CPU and motherboard are all watercooled so temps stay in check. GPUs stay in the 40s under the heaviest loads.

Is it the HX1000 or my mobo thats causing a short? But if its the mobo, why doesn't any problem occur with the TX750. Please help what should i do?
Edited by Timechange01 - 5/23/11 at 9:45pm
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post #2 of 15
Maybe one of your modular cables are faulty? So whenever you move something in or out it either works or doesn't?
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post #3 of 15
Thread Starter 
Quote:
Originally Posted by soulster View Post
Maybe one of your modular cables are faulty? So whenever you move something in or out it either works or doesn't?
I didnt change any of the modular cables though. I left everything exactly intact except I removed the wires only from the components (motherboard, GPU) to test out my old TX750 PSU. After testing the TX750, I plug everything back exactly the way it was but the black screen and restarting problem goes away which is why I find this problem really strange

I would automatically assume its the HX1000 if after removing the TX750, the problem continued but the problem just goes away after I test with the TX750
Edited by Timechange01 - 5/23/11 at 9:55pm
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post #4 of 15
It's best to use the cables that come with the PSU (as per Corsair's recommendation). If it's still not working properly, RMA it.
post #5 of 15
Thread Starter 
Quote:
Originally Posted by mrwalker View Post
It's best to use the cables that come with the PSU (as per Corsair's recommendation). If it's still not working properly, RMA it.
I am using the cables that came with the PSU. When I test with the TX750, I use the TX750 cables (I have no choice since its non-modular)
Edited by Timechange01 - 5/23/11 at 10:06pm
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post #6 of 15
HX1000 is two ~500w units "glued" together. You must be running the 480 SLI off of 1 rail, make sure that you are running them off of 2 SEPARATE 12v rails!
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post #7 of 15
Quote:
Originally Posted by thealex132 View Post
HX1000 is two ~500w units "glued" together. You must be running the 480 SLI off of 1 rail, make sure that you are running them off of 2 SEPARATE 12v rails!
My thoughts as well... because of the HX1000's internal design, it's especially import to pay attention to how you're connecting everything.
post #8 of 15
i had a similar issue with same psu. but mine would randomly restart while idle for no reason at all. i had no choice but to rma the unit to corsair. i hope they fix the issue.
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post #9 of 15
Quote:
Originally Posted by thealex132 View Post
HX1000 is two ~500w units "glued" together. You must be running the 480 SLI off of 1 rail, make sure that you are running them off of 2 SEPARATE 12v rails!
Quote:
Originally Posted by Aussie View Post
i had a similar issue with same psu. but mine would randomly restart while idle for no reason at all. i had no choice but to rma the unit to corsair. i hope they fix the issue.
did you try that
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post #10 of 15
Thread Starter 
I do run the cards separate from separate rails. But the problem at the moment is I only have 1 GPU in my PC. No matter which rail I run it off of, I still get black screen and restart. And its not always during gaming either. it randomly occurs while sitting idle in windows.

None of these issues occur when Im using my TX750
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