PSU issue? Asus power surge triggering

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22 Oct 2011
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I upgraded to a Asus Maximus 7 + 4790K cpu a few months ago.
Had a 6790 HD video card and a GS600 Corsair PSU (3.6 years old) when the issues started.

The PC would restart randomly during gaming and display the "Asus has detected a power surge..." message in Bios. I researched the issue and found out the bios is sometimes quite sensitive to readings and triggers the surge protector too often.

So I disabled the option and the problem got away. Meanwhile, I got a 970 GTX MSI and OC-ed it (no extra voltage). Been working fine for about a month when yesterday while playing World of Tanks the screen turned back and eventually restarted. Checking the events log I saw that the nvidia driver was shut down and recovered successfully. . . several times in succession every few seconds.

Second day the PC resets directly while playing.

I turn surge protector back and as soon as I got into PlanetSide 2 in a battle, the system would reset and display the surge protector message again + other times like having a video in chrome and just browsing in other tabs.

Disabled the protector again, and it seem that the crashes have become quite frequent (usually when starting a game).

Already ordered a EVGA SuperNova G2 750W '80 Plus Gold' Modular Power Supply but what if the issue is still persistent? What should I even RMA? The video card, the motherboard, the CPU ?


Appreciate any help or input I get!



Update: restarts seem to occur now whenever I enter a game 90% of the time (surge protector off). Went into the bios, +12v readings were 10.8 - 11.3 fluctuating. I know these are not always accurate but it usually shows 11.8 or more in bios. I really hope it's the PSU and not the mobo . . .

Also there seems to be slight coil whine on the GPU in cases where it was not (ie when I manage to get in WOT and it does't reset), it used to have no coilwhine at 61fps in that game, now I can hear it as if I was in a 1000fps menu
 
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Udpate: PSU arriving tomorrow. As mentioned in the first post, the voltage readings fluctuate quite a lot under load (11.3-11.8). I know software readings are not accurate, but fluctuations, if I'm correct, always (or most of the times) are, since they show a change in the MB's sensor state.

Also, I have some official confirmation that although +12v can go +/- 5%, it HAS to be stable at that value and NOT fluctuate during use:

https://www.evga.com/support/faq/afmviewfaq.aspx?faqid=59025

According to this, I'm 8x over the safe limit
 
final update:

new PSU installed, seems that there are no more resets, even with ASUS's power surge protector enabled. Guess the motherboard wasn't lying or too sensitive after all
 
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