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Safe to asume my psu needs replacing?

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post #1 of 15 (permalink) Old 10-22-2019, 10:10 AM - Thread Starter
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Safe to asume my psu needs replacing?

Running a AX860 with a 4790k R9 290x. My goal is to oc the 290x but any time I up the voltage I get weird inconsistent results, screen flickering, black screen, ect, more voltage more issues. I also noticed GPU-Z reads 11.4v on the 12v rail under load. I know it's just a software reading but from the above mentioned is it safe to assume faulty psu? Thanks

I should also add my temps are good including vrm's, nothing above 70c

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post #2 of 15 (permalink) Old 10-22-2019, 10:20 AM
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Software readings are a not accurate way to read voltages so no you should not asume your PSU is faulty it might as well be your GPU
If you want accurate readings you need to use a digtal multi meter

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post #3 of 15 (permalink) Old 10-22-2019, 10:32 AM - Thread Starter
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Quote: Originally Posted by shilka View Post
Software readings are a not accurate way to read voltages so no you should not asume your PSU is faulty it might as well be your GPU
If you want accurate readings you need to use a digtal multi meter
Ok I'll do some testing later. Any ideas what point to probe?

Picture if that helps
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post #4 of 15 (permalink) Old 10-22-2019, 10:48 AM
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Start with end of the PSU cables you can find pictures on google showing you which pins are for what and what voltages they are supposed to have

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post #5 of 15 (permalink) Old 10-22-2019, 11:13 AM
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You can ground the negative to the chassis, with DC voltage reading prob the points you have shown in the screenshot. The reading can be +-5% on 12v

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post #6 of 15 (permalink) Old 10-22-2019, 11:26 AM
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Depending on a motherboard, the +12V reading where's a bunch of voltage readings will be bullbrownstuff. In the following column with VRM reading there should be another +12V reading and that one is correct. I had a case of 11.4V readings with a Corsair CS650M PSU, but I was not able to find such table on the entire motherboard, all multimeter readings were 11.9-11.96V - same as the aforementioned reading.

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post #7 of 15 (permalink) Old 10-22-2019, 06:03 PM - Thread Starter
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Got time to test it with the meter. At idle it reads 11.98, under load 11.85. I just poked around till I found the lead that was effected by load, turned out to be #1 ground #2 positive in the pic.

So with the +-5% wingmman mentioned that should be alright correct? Appreciate the help.
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post #8 of 15 (permalink) Old 10-22-2019, 06:16 PM
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Quote: Originally Posted by roost610 View Post
Got time to test it with the meter. At idle it reads 11.98, under load 11.85. I just poked around till I found the lead that was effected by load, turned out to be #1 ground #2 positive in the pic.

So with the +-5% wingmman mentioned that should be alright correct? Appreciate the help.
The 12v reading you acquired is well within tolerance. So the 12v voltage is fine. LINK: https://www.lifewire.com/power-suppl...rances-2624583

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post #9 of 15 (permalink) Old 10-22-2019, 06:32 PM
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measuring the 12v rail of your PSU and saying it's good is the PC equivalent of kicking a car's tire and calling it mechanically sound because it's not flat lol.

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post #10 of 15 (permalink) Old 10-22-2019, 06:45 PM
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Op a more accurate test would be to load the graphics card with a game then probe the reading on the 12v rail.

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