So I got a Prime95 stable 4960X OC and everything else is stable… except x264 (in FFmpeg) on Linux.
Somehow, Prime isn’t as stressful as x264 and oddly, using a default BCLK makes the stability worse. 10 seconds to a crash with a default BCLK, 6mins to a crash with a modified BCLK.
The only way to stabilize it is to “AVX offset” the multiplier by -1. I’m stumped… Prime is the most stressful program I know, and I even ran Linpack. Why the heck is Ivy Bridge-E being uncooperative with Linux x264? I literally tried everything, upping the VTT and VCCSA, upping to the max safe Vcore, nothing worked.
I’m at 1.35V at 44 x 100.1mhz. 43x100mhz at the same voltage was stable for x264, but I’m stumped on why x264 and why it specifically…
A TEMPORARY ANSWER:
Vcore was low and 100.1 BCLK was causing instability. In fact, never change the BCLK from 100mhz for mission critical on Ivy Bridge-E.
Unfortunately, after a month, it still starts crashing.