I was referring to what zsamz said not you, I should have quoted him. I just meant that due to the inherent differences between the two chipsets, you cant set a P45 to the same FSB/PL settings as a P35, on any given divider, a P35 will be able to run a lower PL.
What you can set on a P45 depends on the bios and chipset revision, and how much vNB you are prepared to give it.
Its just a matter of playing around with your gear. I can run PL7 at 480 FSB / 640 MHz (3:4) without any trouble, and PL6 at 434FSB/651 MHz (2:3).
I could go higher, so if my board allowed stable ram speeds of 666MHz I'd guess it wouldn't have issues with PL7 at 500 FSB. The UT/DK P45's/UD3P's do clock ram better than my M2F so 500FSB PL7 / 666 MHz stable may well be a possibility on those boards. Someone try it
480 FSB / 640 MHz CL5, PL7, Clock Twister Moderate
434 FSB / 651 MHz CL5, PL6, Clock Twister Stronger
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