i dunno if i can change the multiplier for this p4, i think it's locked at 15. well i put the fsb at 270 and the vcore at 1.52 and it's running stable! i just ran prime95 for a while and there weren't any errors or anything, about to run memtest. i have the memory at 810MHz, i don't see much point in overclocking it at the moment. i'm idling at 32C with 45C load.
to mtb211: how hot does your core2 run? it should be much cooler than mine, but it depends on what case you're using and what heatsink you are. i'm using the zalman 9700 which is a beast. in my laptop this P4 was running at 70C idle so it's definitely the setup i have right now.