I got a Core2Duo E8300 2.83Ghz overclocked to 3.4Ghz on a nvidia 680i mobo. All I did was unlink the RAM and FSB in the advanced chipset features. I set the FSB to 1600, auto voltage everything , set my ddr2 800 to 800, enable the .5 cpu multiplier, disable Intel speed step/TM1-TM2 and any other power saving options. My CPU/FSB ratio is 1:1. Note this may be different settings than other non-nvidia boards. Either way you'll be looking for a way to increase your FSB to 1600mhz and let your ram stay at 800mhz so you'll have a 1:1 ratio. I have my OC'ed E8300@3.4ghz - 4gb ddr2 800 - EVGA650ti SC. I keep this as a legacy machine for my older games. I cannot play many of my new games on it cause of the motherboards max of 4gb of ram. Oh yeah, also running stock heat sink 39c idle and 56c load.