Originally Posted by Airbrushkid
I meant to say why do they video cards that require 4 ghz cpus?
They don't require them, but the faster (ie: more processing) the cpu is, the less of a bottleneck they are to the more powerful cards. To give you an example, my old E6600 Cpu allowed my 8800GTX to operate at full capability (or close enough to it) however, it was a severe setback to the GTX 280. If I overclocked the E6600 to 3.6Ghz from the 2.6Ghz it normally operates at, it allowed the GTX 280 to have a higher output.
I then replaced the E6600 with a Q9550 and overclocked it, which reduced the bottleneck even further.