Sup guys. First let me start with my sys specs. Pentium D 915 @ 2.8ghz 1gb DDR2-667 ram (have no idea on the brand, bought in japan) 7600GS 256mb SB Audigy 2 430watt PS (also japanese) SATA 160gb hitachi IDE WD 200gb IDE Maxtor 80gb LG dvd/cd burner Pioneer dvd/cd burner Im wanting more performance out of my rig for gaming. Im wondering what out of these three things will get me the biggest performance increase. Overclocking (would require new mobo since I have a low end gigabyte), an 8800 GTS 640mb (I can get one for $300 from a friend), or an upgrade to a core duo processor? I keep hearing about how the core duo's annihilate all and Im leaning that way. If I do get one, can I just plug it in and be good to go? Or do I need to fresh install windows again? Thanks for any info.