Yup. That's my reason for wanting to do it too.
OK I managed to unhide and enable the NBStrap option in the BIOS, but sadly it doesn't allow independent MCH straps.
e.g. I set 1:1 memory and the 800 strap, but it boots as if I had selected a 1:1.66 memory divider. MemSet confirms the memory as 333Mhz and the "Performance Level" (actually tRD) as 3.
Still, I learned a little about how to unhide and enable BIOS options.
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