Hm, I'm having the same problem at the mo. Playing with settings to see if it helps. I'll let you know if I figure it out. In the meantime though, I'm moving this to the Oblivion thread. Please try to keep all Oblivion related questions etc in those sections, okay guys?
Right use a multiple G prosesser then, foward the Cpu to the internal link, join the two giga processers ,then get an axe, hit the computer with it untill its broken into tiny little fragments of its original annoying, irritating self.