Originally Posted by gooddog
Try lowering the QPI memory speed (or whatever it is called) rather than having it on auto. Put at lowest number.
Can't do. P6T and R2E do not have negative multipliers for QPI/DRAM when using Core i7 920/940. It's set at 18x by default always (can go higher though I think, but this is useless). Uncore is also 16x by default, and can only go higher which is again useless.
What kind of Memory are you using?
The new Corsair Dominator 1600MHz triple-channel kit that runs at 1.65V.
I have already determined that the max BCLK I can get stable is 222MHz, and the max memory clock I can get stable is 1950MHz with 8-8-8-24 timings, but I also noticed that has no influence on my ability to overclock as those all vary depending on what other settings are (like voltages, multipliers, etc.).
Right now the best I managed to get is 19x210 for 3990MHz with around 1.368V, though I am running 19x208 with 1.344V for the sake of lower heat. Under Small FFTs I peak out at 85C, Large FFTs 80C.
I think it is the heat that is really doing me in. I have seen numerious examples now where better cooling on i7 equated to lower voltages (less leaking current) and better overclocks. Even I have managed to go from rock solid 3.4GHz with stock cooler to 3.99GHz with CoolerMaster V8. My setup is definitely not ideal for heat though as my case is in a corner of a room on the floor, and there is a heater near by.