Biggest game breaker is going to be your graphics card. That's all that's going to matter in any of those games. You can run them on just about any quad core assuming its 3.0 ghz+ and you have the know how of to OC it. I'd also recommend going AMD on the cpu/mobo/gfx if you're going for a budget build. Get an FX 8xxx series cpu and whatever am3+ mobo suits your needs. It'll save money here and there and you can throw it into a better graphics card. If your mobo can handle it as well switch the 2x4gb ram for 4x2gb.