You don't need a high end chip for gaming though, it's mostly GPU-bound.
I beg to differ. Some very popular games are also very CPU-bound. GTA V, Kerbal Space Program, and Project CARS are three well known titles I can think of off the top of my head that run a lot worse on the Phenom II X6 1045 (2.7GHz hex-core which I overclocked to 3.5GHz) in my secondary gaming machine than on the i7-4970k (4GHz quad-core, not overclocked) in my main desktop. Both machines have SSDs, 32GB of RAM, and GeForce 970 graphics so the CPU is the only significant difference.
AI and physics simulation still lean heavily on the CPU. Here's some benchmarks from Project CARS (which just came out last week) showing how important CPU performance is when simulating 30 cars on the track: http://pclab.pl/art63572-29.ht... (article is in Polish but numbers don't need translation)