i just built a P4 2.26 with a Asus P4T533-C mother board. It has 512K of PC1066 Rdram that came from Components Direct. When the BIOS is set to Auto for the ram multiplier it goes to x3, which is for 800mhz, at this everything runs fine and stable. When I set it to x4, for 1066 mhz, something windows wont even load up. Other times it load then programs start doing strange things and locking up. Any ideas????