I am thinking the memory is what is holding me back in my overclock. System is in the signature. Everytime I raise the FSB above 168 the system will not boot. I have tried adjusting the vdimm, but it will not post when set to over 2.7 . Any changes to the timings that I try, and the system will not post either. So thus far all my overclocking has been done by the multiplier. Could the BIOS be an issue?