Quote Originally Posted by sierra_bound
The best performance on this board is 400FSB of less with 4:5 or 2:3 memory ratio. I think FSB is generally overrated. It's really memory speed that gives the biggest boost.
That's correct in general, yet not always. Perfect example is to compare 3-3-3 with 4-4-4 at FSB lower that 400MHz (e.g. 360 or 370) It's a perfect example, that P5B Dx is weird, to not say a bit screwed up

What I was trying to say, is that with NB strap change memory ratios change (1066MHz FSB strap @ DDR2-800 is 2:3 and at 1333MHz is 5:6). But from experimenting, boot @ 400 and Clockgen to 450 vs straight boot @ 450, would result in different memory speed, yet it doesn't seem so, judging by level of stability. That's why I'm not so sure if 401Mhz results in a 1333FSB strap or rather only NB timings get loose.