There seem to be quite a few people having problems switching off 1:1 on the IC7 with the winbond CH5 chips... even at much lower clock frequencies. I'm hoping that is my problem as I'm completely stable at 220FSB, Memory 1:1/2.7v, 2-3-3-7 and CPU at 1.55v but I can not even boot at 225FSB, Memory 3:2/2.7v (300DDR) 2.5-3-3-7 and CPU at 1.7v. I'll test 225FSB at 1:1 tonight to see if it works. BTW 225FSB was doable at 3:2 when I had the Corsair PC3200/HyperX 3000 mix but I never ran it through prime.

Eric