Orthos is the easiest to use I'll edit in a download link in a few seconds. Its easier to use for dual core systems because you don't have to create 2 shortcuts like you do in Prime95 to load each core.
after running those, run games and stuff see if anything "weird" happens to the AI or something like that, it might be stable, but it also might produce errors that finding primes dosent pickup
If you have Vista, run the Windows Experience Index test again. It stresses your CPU pretty well. If that gives you a BSOD or a turn off, then running Orthos or P95 is pointless.
iv overclocked my p4 630 3GHz to 3.45GHz but not seeing a big temp differance idle when its not overclocked is about 30c, and on load its about 42c, idle when overclocked is 35c, and load its gone up to 44c, shouldnt there be a bigger temp rise?