2yrs stable, now WHEA_UNCORRECTABLE_ERROR

[heyrobscott]

Purchased and built my ASUS P8P67 Pro rev (B3.0) + 2500k in June 2011, OC'd at 4.5ghz from day 1 and was always stable, but in the last two months have been experiencing lockups and BSOD reboots with WHEA_UNCORRECTABLE_ERROR. When OC'd, Prime95 will trigger in less than 5 minutes. With BIOS non-OC'd at factory settings, Prime95 will run for hours, but running Battlefield 3 will cause a lockup within minutes. Only change to system is Windows 8 upgrade last fall. At time of crash when OC'd, core temps never rise above 61.

I have tried BIOS upgrade/downgrades, CMOS resets following explicit ASUS instructions, Windows 8 clean installs, swapping RAM to test, reseating CPU with fresh thermal paste, cleaning out case, drivers, etc. I assume the issue is either with the CPU, motherboard, or power supply (Corsair HX 650w). All 3 are under warranty, but I don't know how to narrow down the list.

Only other weird thing - if the system hardlocks, it will take the internet with it. The system is connected to the RT-N16 router by ethernet. The router is still responsive by wifi at this time, but Internet won't work over wifi until the desktop restarts. I've tried unplugging ethernet and disable the mobo's NIC but the crashes and lockups still continue.

I've attached the SF Diagnostic ZIP, plus the WinDbg x64 report. Any suggestions? Thanks for the help!

 

[derek10]

That error is 99% hardware. The only way to narrow down CPU or motherboard is to try another CPU or another motherboard, but CPUs rarely fail unless very abused. Check PSU voltages in BIOS or with a DMM and try to remove non essential hardware or try a lighter video card. Also check the hard drive.

 

[heyrobscott]

+12V jumps to 12.192 when OC'd and Prime95 running. (+5V at 5.160, +3.3V at 3.376)

Vcore averages 1.352, jumps between 1.3 and 1.6 OC'd with Prime95 running.

 

[heyrobscott]

I may have just hit a breakthrough - changing the mobo settings to match those in this video have let me run Prime95 for over 30 minutes with no issues! BF3 also ran fine for 10 minutes.

Overclocking i5 2500K to 4.5 GHZ with ASUS P8P67 Pro by Britec - YouTube

It's too early to mark as solved, but I'm going to let Prime95 run overnight and see if I need to adjust from there. Thanks all for your help!