You'd never know the difference. Switching to 2.6 gig would never show up either. Unless you are going to increase your speed by 50% there's no point in upgrading. Your next step should be a 64 Bit processor or a dual processor system. Performance increases through higher clock speeds have plateaued due to heat. Intel has cancelled their 4 gig plans.
Get more RAM or faster RAM, a faster hard drive or if you game a faster video card instead.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS