I spent some time working on mine this evening. 4.0 was so easy (remember, I have the 965) that I didn't feel it was worth shouting about. Trying to get 1GHz OC, and beyond, has been a bit puzzling. I've spent a lot of time on "that other forum" where there is a great deal of additional information about ratios, but as much research as I've done, I can't find anything definitive when it comes to voltages. I guess that's just how it goes with a new chip.
I actually have what appears to be a stable 4.2 combination. Numbers are something like 27x157
for something a little different.
I see no need to push my RAM beyond 1600 - and it will do that on nice stock volts, and BCLK in the 160 range works nicely for that.
I'm most confused about the different voltage requirements and Uncore speed. I can get 4.3GHz on the core if I drop the Uncore speed. Problem is, I am trying to find optimal performance for the system overall, not just a trophy-winning CPU clock. I can up the voltage (labelled QPI/DRAM core in the P6T bios) but as you'd expect, beyond a certain speed it's not stable.
Due to the cost of this CPU (
) I am keeping my voltages pretty close to specs, VCore is 1.37, and Uncore voltage around 1.275V. I'm sure more voltage would help..
I'll try some Sandra tests to see if I can find a relationship between overall performance and Uncore speed, at least, the point at which a low speed impacts performance. Problem is, what is "overall performance"?