I run 3.3GHz on a 3.0C processor, it idles around 27-28C on the P4P800. I think the keys are having a blowhole on top of the case (ATC-201C), an outlet fan near the NB/CPU, and my Zalman 7000CU HSF (with the regulator) applied with ceramique. I can actually go a bit lower but I put my Raptors right in front of the front fans. Also I clean my case somewhat regularly with compressed air. Room temp is 68F. Max T=42-43C (after an hour or so 2XPrime95). A good cooling solution is critical with this chipset I think.