There are lots of different factors that go into processor speed as well that you would need to consider: Front Side Bus Speed, how much cache memory they have, also the core of the chip (Prescott I think is the newest P4). If your current processor is not keeping you from using plug-ins or something, then I wouldn't bother with an upgrade, and you probably wouldn't see that much difference in that step anyways. With processors it's always a game of holding out as long as possible, then snatching up the best thing you can afford when you do decide to jump. Also, on your next upgrade, I would consider going with a 64 bit processor to prepare for the future.