You will want the quad core. Games are going to start getting more multithreaded, and the dual core won't cut it at that point. They really don't now. As suggested above, look at the Athlon x4 860k if possible. It may be cheaper and should fit the socket, and is a quad, just does not have the integrated graphics. If you can't get that, get the a8. But with already having the 750ti, you won't be using the built in graphics on the apu.