Hey guys. Sorry if my title was inproper. I just want to impulse buy tonight! I have a Single 1.8Ghz G5. I don't really understand what a 2.0Ghz C2D means? The guy on the phone from an apple store said it was one processor with two cores. Is that right? Well, whats a core then? Is a 2.0Ghz C2D faster than a 2 x 1.8Ghz G5? My G5 has 1GB memory and 160HDD. With a pretty ****** gfx card. I want to get the 20" iMac 2GB memory with 500HDD, tonight. Will I feel a big difference in performance? Thanks in advance guys!