Any word on a new P5B-DLX Bios yet?

[Pyr0]

Nothing's wrong with 4/5. I run @ 1060mhz 4-4-4-12, 2.4v memtest/superpi stable, with my SuperTalent PC6400 (5-5-5-15 but with D9GKX). Chipset voltage @ 1.65v, bios 804.
Have u tried other ram?

i believe that's because you've changed straps above 400MHz
can you run with a 400FSB, 4:5 and 4-4-4 timings? (completely 100% stable)
i can boot like that, but there's very little stability
using other memory dividers i can run the memory well above DDR2-1000, 4-4-4 fully memtest stable