Quote Originally Posted by rge View Post
There are 3 lotteries you play when you buy a chip.

vcore lottery, qpi/vtt lottery, and TDP (watts/temps) lottery.

My i940 was above avg for C0 in vcore lottery, was excellent in VTT lottery for C0 (prime 210 bclk with 1.3qpi/vtt), and OK in TDP lottery.

My i950 will do 4.4 23x192 with 1.34 vcore, 1.34 qpi/vtt.
But to prime 4.3ghz 21x205, I need 1.46 qpi/vtt. Others can do 21x205 with 1.2-1.3 qpi/vtt. In other words my i950 did well in the vcore lottery and poor in the qpi/vtt lottery.

My guess is your chip did not do so well in qpi/vtt lottery either (or vcore). And playing with the other volts may save a notch or 2, but I would fix the 90% problem first. If you need 1.42 or 1.44 or 1.46 qpi/vtt, you are not going to obviate that need playing with other things...you might make .01 difference, but worry about backing down a notch or two, after you fix the 90% problem. Above 195 bclk, my chip starts eating qpi/vtt to be prime stable.

But unless you have a ram problem, which I doubt, you likely are deficient in either vcore or qpi/vtt. You may or may not want to run your chip that high 24/7 (everyone has own view on this), but rather than wasting your time, I would set it there, prime it, and if that solves your problem, then back down as much as you can. Then play with other volts and see if you can take it down another 1 notch.
So with Vcore 1.35. I should try going higher on qpi/vtt?
If so how much further should I go MAX... where would I not go near as far as qpi/vtt voltage?