If it runs at 3 GHz or more and costs next to nothing, as long as there's more than one core it's good.
Several cores can make a game run more fluently by taking the load off the very cores that are needed for the game itself. Let's say your game runs on two cores and you'd like to run Teamspeak, TrackIR, Antivirus, inspirational music etc. in the background. By addressing them to run on the "free" cores might help with petite freezes and such.