I was looking at the reviews, and some have managed to get the board to work with their ddr2-800 ram but the board slows it down to 667, and can't OC it back to 800 in the BIOS.
I originally purchased that same board (P5NSLI) from ewiz, but never opened it up since I have a pair of g.skill ddr2-800's and I called Asus to see if the board would work with them, but the guy just told me that he doesn't know, and just try em out to see if they work, but I never did since I didn't want to risk it.
The S3 is okay, DUMO from XS got 485Fsb with it on either a E6400, or 6600, I forget which.
C2D E6600 @ 3.15ghz w/ 1.35 vcore
2GB G.Skill DDR2-800 (4-4-4-12)
XFX 7600GT xXx