One stick of my Corsair 8500 went bad a few months ago and up until last week I've been running vista-32 with just one gig of ram. I installed this 4- gig kit a few days ago on my p5n32sli expecting a stability drama to ensue. In the bios (1205) I set the memory basic timings at 5-5-5-15, left the advanced timings in auto and voltage at 1.9.
I ste the CPU/FSB ratio as unlinked FSB=1423 and the memory speed at 810 which gave me 800.4 actual memory speed and an overall CPU speed of 3201MHz
Vista recognized 3.325 out of the 4 gigs which is groovy and the best part is that I've had absolutely no stability problems at all.