PSU failing?

Soldato
Joined
21 May 2010
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3,448
Location
Digbeth
Unsure...


So, I have a respectable system (12700KF, 6800XT, etc) running on a Corsair SF750 PSU. The PSU was tested with a 9900K and 3090 under HEAVY loads to make sure it worked fine. But now I'm experiencing some odd issues.

About 8 or 9 weeks back, maybe a few more actually, I updated AMD Graphics drivers and when my PC rebooted into Windows, it powered down. I tested everything and used a PSU tester too, nothing. This made me think the PSU had failed. However, before deeming it so, I tried a new kettle lead and I magically had power again.

This evening, I got home from work, powered on my PC, it hit Windows, and powered off. I tried a new kettle lead immediately, and nothing. Ruled out the lead. I tried my PSU jumper to see if the fans would work (On a PWM hub), nothing. This left me perplexed somewhat. About to rule out a dead PSU... I grabbed the only PSU I have here, an NZXT S650... Doesn't have enough PCEI connectors sadly, so I pulled mine from the Corsair and had a good look to see in the pin-out was the same, it isn't. Anyway, I didn't even connect the NZXT PSU. I reconnected everything in my rig, and pressed the power button one last time... And I have power again.


My system shouldn't pull anywhere near the over-power protection for the SF750 (It's around 930W). I'm thinking that it's actually faulty and it on it's way out? As this is an issue that isn't replicable I'm struggling to figure out how to actually diagnose the issue too.

Any ideas?
 
How old is the SF750? excellent PSU but even the best can be faulty.

Sounds like a short or something loose so when you move stuff it fixes the small issue. Other thing could be that it started with a driver update , maybe go back to an older version or update firmware on gpu. Could have an odd issue with gpu spiking power and causing a shut down.

I do not have any definite ideas other than the ones above so what I would do is remove the mobo etc from the case and rebuild it on a cardboard box, once that was done I would run furmark and blender at same time for a psu torture test to hopefully rule out that as a problem.
 
Is there anything in Event viewer/reliability history for those shut downs?
EventID 41 would hint more to hardware crashing down than software issue.
 
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