There is no universal problem of bottlenecking. Some games or applications are relatively more CPU-intensive, and some are more GPU-intensive. Assuming you're gaming, the 7770 will be the limiting factor in basically any setting relative to any current CPU, except maybe at very low resolutions in certain games (but that's an invented problem). So, without knowing more--we need to know your motherboard if you have one, your intel/AMD preference, and your screen resolution--it's pretty hard to make a positive recommendation. OTOH, if your only criterion is that it not bottleneck your 7770, you can freely get pretty much any processor.