Quote Originally Posted by Sam_oslo View Post
Good quick Super Pi 32M results .

You have chosen the easy (and always correct) answer.

I kept the same VVT (1.29v) and Vdimm(1.63v), and same 6-6-6-24 x6 mem, that i have used for @4GHZ Ht.Off (1.26v) and have been primestable, and only raised Vcore (to several values between 1.32- 1.35v) to stabilize @4GHZ HT:on. But it gave me instant freeze at the start of the prime95. I raised VVT too (between 1.31v to 1.43), and this is in line with your suggestion, and it still freezes. i didn't touch Vdimm or timings.

It seams that i have to hit a "sweet spot" for vcore, vtt and vdimm (that i haven't yet been able to find) to get it primestable @4GHZ + HT.
Try enabling turbo mode and use 191 BCLK. Alot of boards just aren't prime stable above 200 BCLK. I've never tested HT off on any of my stablity tests.