Dude dont be stupid. Don't listen to the guy above me, i overclocked the very first powermac i ever had, and it barely helped, it was super super unstable, and crashed constantly, and then it came to a point where i couldn't even boot it up. I had to buy a replacement off ebay. And lucky for me, it was like 20bucks. for an intel core 2 duo, you wont be so lucky. a 2.0 is plenty fast enough, be happy with your mac.
oh lol not deltamac, i was talking about the freereg or whatever his name is.
NOT delta mac, he's right.