I have both a 5400 rpm and 7200 rpm Hard Drive (both at ATA100), there is really NO massive difference in speed. If you have the money though, I guess you might as well get one, but you would never notice a difference if you didnt have them sitting beside each other, I am talking only a matter of a few seconds. Good Luck on your choice. The NOSPIN Group is now offering Free PC Tech support at our newest website: http://freepctech.com