2048MB running at 333MHz but 1024MB running at 400MHz. I have an A8N-SLI mainboard and BIOS 1008. When I install 1GB (2X512) D/C Kit PN - OCZ4001024V25DC-K of OCZ RAM it clocks to 400MHz but I when I doubled it and have 2GB (4X512) D/C Kit PN - OCZ4001024V25DC-K it runs at 333MHz without errors. I read the Asus website FAQ and I tried to manually set it to 400MHz as Asus specified but I get errors from MemTest86+ v1.60. Does anyone have any ideas?