Hi guys. Well its done I've spent 2 days tinkering and got my system as good as it will go, though I find its not as well as I thought it could. I've managed to push an xp2600 b from 2083mhz to 2140mhz at 1.675v. My board has gone from 166mhz to 171 mhz with a multiple of 12.5. Its my RAM that seems to give me grief, maybe thats why I've peaked so early. I have a 1g stick of seitec that was sold as PC3200 but I've been ripped its only PC2700. Whenever I try to manually input timings or manually adjust its ratio the system crashes. As long as its on 'high performance auto' settings its fine. I ran prime95 for 12 hours with no errors and at 45c. I also ran memtest86's 9 tests with no errors. Is it because the RAMs max clock is 166 that I cant do much more? And is an Aopen that I've now discovered is only 250w sufficient? Oh and thanks for such a consise overclocking guide, this site rules!