So I pretty much gave up on 5Ghz+ for daily use . Not worth how much I had to bump the voltage to get it stable at all; too high temps for my liking too.

I am working on stability at:
i7-2600k @ 4.8 HT off, 1.350v
I know 1.325v is unstable (small fft fail < 1 minute).
4x4GB @ 1866Mhz, 8-9-8-24-2T, 1.625v
I know 1.600v is unstable (blend fail < 1 minute).

At the above settings I ran blend overnight; 3 of 4 threads were still running after 8+ hours; one thread failed with a rounding error after ~2hr.

I am testing a bump in VCCIO to 1.07500 currently - does anyone have any insight as to where I should look for additional stability at these settings?

Thanks,
-sfxs