NVidia Chipsets have some mean strap changes where perfomance drops significantly at a certain FSB-speed. I know you want to reach a high CPU-clock, so these settings are optimal for you, but for highest Everest scores I still think you could find better settings.
Try 395MHz FSB 2:3 divider and run Everest and then 405MHz 2:3 divider.
I would like to know if 780i is still like 680i was.
My guess, tRD=6 at 450MHz FSB might be a bit tight...
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