I swear that Prime95 has a problem with stuff over 3ghz. I've got a P4 2.66 running on an Asus P4PE with a 512MB stick of Corsair XMS3200.
I can run 3dMark, Memtest, games, applications, etc all day long with it at 155FSB, 3.1Ghz, 413DDR, 1.575Vcore, 2.6 Vmem.
Prime95 craps out within a...