The difference would be insignificant - the marks may improve 10%; not so much that you would notice on a workstation or normal duty home comp. You're missing an unnoticeable touch of speed & ncq - which is a file server technology. The IDE setup is fine.
If one was a hardcore performance freak - this wouldn't be the drive to be considered.
But its' price per gig and 5 year W make it a super, middle-of-the-road drive.