You can probably tweak the CPU up higher than that, though you might need to run your ram asynchronously. Try Turbo mode(or aggressive mode, whatever it is, don't wanna reboot to look), Asus's hacked pat, doesn't introduce as many wait cycles into memory access as 865 does normally(to allow 800fsb operation). Least think that's the difference. SOmething like that anyways.
Lots of little things in there you can play with, pretty full featured bios.