Random power cuts

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18 Oct 2002
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Southern England
HI all,

Recently upgraded my son's PC from a Phenom II x4 965 Black Edition with a GTX 960 to a Rysen 5 1600x with an RX580.

In the last couple of days the pc will shut down randomly whilst playing games. The PC shuts down when under gaming load, it'll run Prime95 all day long without so much as an issue and CPU temp gets no higher than 36c. RX580 temp gets to about 75c which I understand is normal for stock settings.

I've done all the usual things, reset bios, updated drivers, cleaned out dust from PSU (it was caked in it!), re-seated everything and checked the event log to see if it could tell my something (it couldn't).

I thought I'd fixed it by doing all the above as the PC worked fine for about an hour playing assassins creed Odyssey which is hadn't managed before. Thinking I was clever I overclocked the rx580 form 1350 to 1450 via the "radeon watt" software and instantly the machine powered off.

So now I'm thinking that its the PSU that's causing the problem. it's a lenovo unit from a server rated at 1000W (DSP-1000GB) which I've been using for about 5 years. Never had an issue like this with the Phenom built so I think the additional load from the RX580 might be pushing the too much.

The 12v rail is pushing out 11.33 to 12.33 which I think is ok but I can't help thinking that there is something not quite right here. that or the RX580 isn't well.

I've run OCCT and tried the "Power Supply" test. the machine turned off instantly.

So any thoughts? I don't have a PSU I can use to test it so before I check some cash at a replacement is there anything I can do?

UPDATE: installed the old GTX960 and it ran the OCCT Power supply test without issue. So either the RX580 or the PSU is at fault.
 
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No matter if its server grade and heavily oversized, PSU full of dust could have cooked up its capacitors.
And certainly that kind voltage variation would be unacceptable.
Even if software readings can be unreliable, like some weeks ago one user having software claiming 5V to be near 10V, it shouldn't vary like that.
 
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