[Raapys]

To my knowledge there's no real cons against quad core( except price, and bigger cooling and power requirements ) compared to dual core. Intel's quad core CPUs, the only quad cores available at the time, are simply two of their dual cores put together on one chip. Given the same clock frequency, a quad core and a dual core will perform equally in applications/games that only support one or two cores.

The catch here is, as mentioned, the price. The 3ghz dual core costs the same as the 2.4ghz quad core.

Personally I think it's only about a year or so before most( if not all) new games released will take some advantage of quad core, though.