I had a similar problem earlier. I hve just bought a 1 gig Athlon with an Epox mb. It showed it running at 1 gig. Had problems though with the mb in connecting all my add ons. Changed the mb to a A7V133 but showing it running at 750. Do I need to set the jumpers to manual and then set fsb to 133 and 7.5x multiplier. What are the best settings for o/c to and what core temp to rum at. I play mostly 3d games. Have tried to o/c but keeps stalling?