I tried overclocking my CL56 and couldn't really get too far w/o the computer crashing and setting back clock speeds to defualt, so I just left them default.
I did score 25,338~ in aquamark increasing to 432/229 but it still wasn't very stable. I didn't spend too much time on it, I'll try some more tweaks later.
On Default Clocks, I got a 23,004 score.
System Specs: P-M 2.0, 7200HD, 1gig-ram, 9700 Radeon, Omega Drivers
Rince, I'm curious to know how you got yours to clocks so high and run stable /w no additional cooling.