PSU random Crashes

ltmark

Prominent
Jan 18, 2018
1
0
510
Hi,I came here in hope to get some insight into a problem that I've been having with my PC regarding my PSU.

About a week ago my PC crashed while playing some PUBG and when it restarted I got a Message saying it had been shut down due to unstable Power Supply Unit(Asus anti-surge),after running setup the PC came back on and it was completely normal for about 4 days,and then it crashed again(this time idle,I wasn't even near the PC,came back to see it on the"unstable PSU press F1 to run setup screen).After that,I've been able to turn the PC on every morning,and I always check the voltage on BIOS before going in,they're normal.When I get into the desktop I open HWMonitor and all voltages are also normal,I'm able to play games,even demanding ones no problem but After some time(5-6 hours) the voltages start to drop on the 12V rail,2 days now I've actually seen them drop to 10.9-11.1,go back to 11.7,start moving like crazy in the 11.1-11.8 range and shut down the PC myself,yesterday It got crashed again cause I wasn't on the PC at the time.

My question is,can this be something other than the PSU?I mean, wouldn't a faulty PSU fluctuate from the start and not only after hours? It seems like clockwork a little after 8pm the voltages start to drop,no matter what I'm doing.Tried different power plugs,resat the PSU cables onto the Mobo and GPU.
Also,If it is a faulty PSU,is it dangerous to play my 5-6 hours a day until it crashes or I have to shut down until I get a new PSU?What could voltage drops do other than data corruption?
 

Aeacus

Titan
Ambassador
At this point, you're looking towards new PSU. Anything from Seasonic is great but without knowing your system specs, i can't say what wattage range PSU would be the best for you.

As far as why you get voltage regulation issues after hours of uptime, most likely, you have such of a crap unit that can't sustain stable enough voltage for more than few hours. Since if you had good quality PSU in use, the PSU's UVP (under voltage protection) would kick in once the voltage drops outside of ATX PSU standard.

According to the ATX PSU standard, safe voltage ranges are:
+12V DC rail - tolerance ±5% ; +11.40V to +12.60V
+5V DC rail - tolerance ±5% ; +4.75V to +5.25V
+3.3V DC rail - tolerance ±5% ; +3.14V to +3.47V

-12V DC rail - tolerance ±10% ; -10.80V to -13.20V
+5V SB rail - tolerance ±5% ; +4.75V to +5.25V

source, page 12: http://www.formfactors.org/developer/specs/atx12v%20psdg2.01.pdf

Anything lower or higher than that aren't safe for PC components. Lower voltage can cause data corruption while higher voltage can fry components. Also, when the voltage drops, the current increases and all affected components must work harder to sustain their work. This will cause the components to wear out more quickly.