Agree with the above.
You might like to read this THG article about balanced systems.http://www.tomshardware.com/reviews/balanced-gaming-pc,2477.html
Unfortunately it is over a year old. It uses the 955 in the analysis but video cards are a little outdated. Still it uses a GTX 260 which in many ways is similar to the GTX 460 and shows that the 260 is not constrained even by smaller CPUs.