I just built a brand new computer with an AMD athlon XP 2600, PNY Geforce FX 5600, Sound Blaster Audigy2, and a whopping one gig of RAM: I used Corsair XMS PC3200 (2 512mb DIMMS). This RAM is crazy-fast and I cant believe how well it performs. I also have a laptop that is running 640mb of RAM and my friend has a desktop that is running the exact same configuation except for he has a single DIMM of the same RAM I bought...it runs circles around my laptop! If you are looking for 'the best RAM out there' look no further and buy the Corsair XMS series.