I Have gotten my P4C 2.4 with my ASUS P4P800 up to 280FSB, i ran prime95 for 16 hours and everything seems fine. I ran burn in tests with sanrda succefully too on the cpu and memory. However when i run memtest86 i get errors and and it doesn't run very long. I have one 256 DDR533 (komusa hyperram) currently (waiting for the other) timings are set at 3-4-4-8-4 (extra 4 in the bios, don't know what its for) at a 1:1 ratio.... i'm very happy with the system, it's running fine, played quake for a couple hours, everything seems fine except memtest.. should i worry about it or no?