I have decided to build a new computer, but it has been a few years, and I haven't been following the hardware scene too closely. Anyway, I'm trying to decide between getting an intel duo or quad, as I've heard heard quad is mostly wasted on gaming. I've picked out the other parts and have a decent budget. just want to get a cpu that would excel at games.

also, is it worth going with ddr3 or just to stick with ddr2?