Its a 2.66Ghz Northwood processor with a 533mhz FSB. I can get it to run stably @ 2.95Ghz (20.0x147) with my OCZ memory @ 220mhz which is also very stable. The issue is that every time I try to go beyond 2.95Ghz, it wont post. It could take a lot more because at 2.95, it idles at 27C and load is about 44-46C. Also, my motherboard doesn't allow the changing of voltage.