After a little windfall I need some advice. Currently my machine is fitted with a quad core duo Q6600 2.6gig overclocked to 3gig. As I am happy with the rest of my rig I was thinking of investing in a quad core extreme processor. As these range from £570 to £830 is it worth the expense? Will I notice an appreciable difference in speed? The machine is used primarily for gaming with a little office work. Any comments/advice would be appreciated.