How well does the core 2 duo e6600 overclock with setfsb compared to a Pentium D 925. I'm using setfsb to overclock my Dell optiplex 745. With setfsb I'm able to get the 925 up to 3.5ghz stable, but soon will be replacing the 925 with a e6600 that I plan on overclocking to 2.6-2.8ghz.
Are you using a different motherboard if not how are you overclocking an OEM computer. Big box OEM's have a locked BIOS and 99.9% of the time they can't be overclocked.