I'm trying to build a custom gaming rig on the cheap. I know video card is the most important part of the equation, I'm curious if I have an i5-650 cpu and a p55 motherboard, which only runs the two sli ports at 8x, will I see a tremendous decrease in the performance of 2 GTX 460's running in SLI. I've seen stuff on here about building a balanced PC and avoiding a bottleneck, I feel like the x58 is more than I need for a gaming machine. I don't think hyperthreading or four cores are that significant or would be used all that much.
Yes its OK,that board supports SLI at dual x8 mode which is as fast as dual x16 in almost all games(unless you play at a resolution like 2560x1600 which you may see a 4% difference).
As for CPU,well its fine and won't bottleneck your cards unless you play at low resolutions(like 1280x1024)