For the comp ill be building soon, im debating on whether to use a P67 chipset mobo, which i dont think can do dual x16(correct me if im wrong) or to take a step back and get a mobo with the X58 chipset which can do up to quad x16. Can someone clarify for me what the performance differences would be for todays games?
...there you have it. There is a slight difference, but nothing really all that meaningful when it comes to real-life performance. I doubt you'd notice it - a better LGA 1155 CPU would probably make more of a difference with a dual-card setup than the lane bandwidth would. Just my opinion.
The difference between x8 and x16 is minor, and the added expense of a x58 motherboard and CPU, combined with the superior gaming performance of the LGA1155 CPUs means that it isn't worth getting a x58 platform unless you want more than 2 graphics cards.
"The Bottom Line
If you are running on a 30" display at 2560x1600 or below, an x8/x8 SLI or CFX configuration will perform the same as a x16/x8 or x16/x16 configuration. The only time that you should even be slightly concerned about running at x8/x8 is when you move up to a multiple display setup."