Are any of you running a pci-e card on this mobo and overclocking? I just got a 7600gt b/c of the rebate deal and now i can't overclock to more than 275 fsb, it's as if the board is not locking the pci-e at 100 like it should. I was stable with my agp 6600gt all the way up to 300mhz, but this...