milage varies.... some 5400s are faster than poor performing 7200s altho that is getting rare now. Some will perfrom near the speeds of 7200s but the real reason to buy a 5400 is pricewise you can get a much larger drive for storage and have lots of room for your mp3s, avi's, or whatever your into. Heh i just added a cheap 40gig 4500rmp ata100 and it benches between the 5400 it replaced and my 7200s.