Has anyone noticed a performance difference between dual core and single processors? The dual core is cheaper on Dell desktops, but a friend tells me that dual cores produce too much heat, and that most software can't take advantage of them. Dual cores are supposed to be good for multitasking, but my multitasking is running a video game, MS Word and Outlook Express at the same time. Sometimes it takes 30 seconds or a minute to switch between a game and MS Word. Would a dual core help with this? Skyf