What is the fastest GPU setup you can have without encountering any major bottlenecks with an AMD Phenom II X4 965BE? Is it absolutely imperative to have a Core i7 clocked @ 4.0 GHz to properly run the latest graphics cards, especially in SLI/CrossfireX? My monitor only goes up to a 720p resolution. I heard that a bottleneck only appears at a certain resolution. My current system is a C2Q Q9400 2.66 GHz @ 2.66 GHz, 6GB 800Mhz DDR2 RAM, and a Radeon HD 4850. (512 MB) I was considering building a Phenom II X4 965 desktop, with 6-8GB of DDR3 1333 MHz RAM, an ASUS Crosshair Formula III motherboard, and a Radeon HD 5870 graphics card. Even if I have a bottleneck with my new PC, should I still see a huge performance increase across every graphical setting, compared to my old PC and HD 4850? The HD 5870 is almost Three times faster than my HD 4850. Most games are GPU bound, rather than CPU bound. A bottleneck with a Phenom II X4 965 @ stock speeds won't pose a crippling hit to performance with an HD 5870?