As i mentioned every cpu is different (1st link in first post - tip #2 and #3
http://i4memory.com/102537-post3.html), each cpu will have optimal cpu vtt requirements for bclk scaling and remember as you increase cpu multiplier the same bclk which was stable on lower cpu multiplier, might need more cpu vtt on higher cpu multiplier.
i.e. 19x200bclk might be fine with 1.37v cpu vtt, but 20x200 bclk might need 1.39-1.47v cpu vtt, 21x200bclk might need 1.39-1.55v cpu vtt. All depends on your individual cpu. Also cpu vtt voltage needed will also depend on your uncore frequency. The higher QPI frequency the more cpu vtt volts is needed. The higher the uncore frequency more vdimm is needed. (2nd link first post, in post #3
http://i4memory.com/f55/intel-core-i...ide-x58-13051/)
For prime95, linx, hyperpi stability again mentioned in 3rd link in first post in this thread
http://i4memory.com/f80/i7-920-d0-df...ability-16617/ (everything you ever you need are in first post's links ;)