Very wierd behaviour here:
With my CPU at say 266 x 10, it's default, vcore on auto, C1E and speedstep work perfectly - when the CPU is idle, the multi drops to 6 AND the vcore drops as well, down to about 1.1 ish (VID 1.35)
If I set 333 x 8 (= same 2.66) still with vcore on auto, the board overvolts the CPU - vcore shows in windows as 1.4v+ - but worse although the multi drops, the vcore does not decrease as it should. Very odd behaviour. Maybe the "strap" needs to be set at 333 rather than auto. Actually setting 333 x 8 the board won't boot at all with DRAM FSB set to auto, you need to explicity select DDR2 667 for it to boot at all. In many respects, this board is worse than the P5N-E it has replaced. But nothing BIOS updates won't solve I suspect.