Well, I actually upped the FSB by 12 MHz (100 to 112) and downed the multiplier from 5x to 4.5x to get 504 MHz. (My motherboard doesn't have fine FSB frequency control, supports 66, 75, 83, 95, 100, 112, and 124, but 124 goes too unstable). About cooling... I'm using a P3 cooler on it. My memory...