Just wanted to add, that theoretically a stripe set with 2 disks should double your hard disk speed, a stripe set with 3 disks should increase it by 3, n disks = nfold increase.. You wont get this sort of increase if you ujse the SOFTWARE RAID that win2k and XP have. RAID 5 (IIRC) is a Stripe Set with parity, parity is just one disk (so if one disk fails you should be able to continue) however if you have 4 disks, then thereteically you have 3 times increase in hard disk speed (raid is very cool, it can push your hard disk speed through the roof) you can have raid 5 with any amount of disks. If you have hardware RAID use it, theres absolutely no reason not to, its likely to be the fasteset volume on your system so thats where you should have your swap file.. if you doubt its speed get a program like sisoft sandra and benchmark each volume.. Also I think MS advise you to split your swapfile over all volumes, (personally i wouldnt if one volume was RAID) Im with most ppl that are saying that theres some poser configuration problem and unless you have other issues with other apps, dont mess with your system config.