I just bought a second hand p5q-e as I had a C2D e6600 which I always wanted to overclock. I read the guides in this forum and understood them and managed to overclock safely to 3ghz with a stock intel 775 cooler extreme edition (which I bought off ebay). My fsb is 333 and my ram:cpu ratio 1:1. I tried different voltages; >1.26 onwards seems stable. I let it do a torture test with prime95 last night with 1.26v but it gave an error after 2 hours. Now I set it to 1.3v (in CPU-Z shows 1.272v) and it has been running fine without errors for 6hours. My temperatures are 31-35 on idle and 50-56 on load. I use speedfan to check the temperatures. In speedfan it has been showing CPU: 50-56c (core 0: 40-46c and core 1:40-44c) under 100% load.
1st question: are speedfan temperatures accuate? I forgot to install realtemp as I did a clean windows install after the mobo change.
2nd question: any suggestions to make the system more stable @ 3ghz with lower than 1.3v? Or my temperatures @3ghz with stock extreme intel cooler are good enough?