maybe i'm being pigheadead but has anyone really noticed any major advnace in processing speed over the last 5 years? every app just hogs more resources it seems without the hardware gains....personally if your pushing it that much I would just get another desktop and run more than one machine.....the gain in a newer chip when you already have 4gb ram isn't going to be that great....just buy a cheap asus desktop from ebuyer for mundane tasks and use your flagship machine for the hardcore processing....whilst making a saving on a shared monitor, keyboard, mouse
