4770K + M6H overclocking: which causes crashes without a BSOD?

[Anusha]

Hi,

I've been trying to get my OC stable. Right now I have the following.

Core multiplier: 44x (sync all cores enabled)
Vcore: 1.285V manually set in BIOS (should change to Adaptive later)
Un-core multiplier: AUTO (x39)
Un-core voltage: AUTO
RAM: Corsair Vengeance CMZ8GX3M2A1600C9 (2x sets)
RAM speed: 1600MHz (XMP)
RAM timings: 9/9/9/24/2T (XMP)
RAM voltage: 1.50V (XMP)
Input Voltage: AUTO
Extreme Tweaking: Disabled
EPU Power Saving Mode: Disabled
Everything else: AUTO

i ran Intel XTU for 12+, Handbrake H.264 for 6+ without a crash.

last night i put a H.264 encode queue and went to sleep. after about 3hrs, the PC had rebooted without a BSOD. there is no bugcheck code in eventlog. what could have caused this? if it was a BSOD with a bugcheck code, i know what to do. but now i don't have a direction.

any help is appreciated.

[Raja]

Reduce overclock or increase Vcore (depending on temps) and see if it still holds out. I would elininate if it is OC related, as stress tests don't catch everything.