AGP Clock?

I have heard that setting the AGP clock in my Soft Menu III BIOS to something like 2/3 or something may actually hinder my OCing more than setting the CPU too high will. Or something like the busses won't be able to take it even though the CPU can? Any help on this?

I'd recommend you read some of the 'intro to overclocking' articles on the front page of this site, they're good stuff! a quick answer would be that, yes changing your agp bus speed can effect performance and stability. The agp divider times your frontside bus speed will determine your agp bus speed. you want to keep it as close to 66mhz as possible, any lower you'll lose a little performance, too much higher and you'll seriously risk destabilizing your entire system.