I agree with techmo34, and would like to add the air flow volumes - make sure that the total of all intakes exceeds the total of all outflows by about 10% (or more) - this will ensure a positive pressure of relatively cooler intake air inside the case.
Ok then, I'll also buy some 120mm washable filters if I'm making the bottom fan an intake fan, can't have dust in my new build lol but here is the entire build
what are the advantages of a x16 x x16 configuration, will it still rival 1 5870 card?
Their is no major disadvantages to x16,x8, so don't worry about your motherboard You are looking at 2 to 3 FPS differences, which won't be noticed outside of benchmarks.
Best answer selected by xxgtasaxx.
Looks like a nice new build. We cannot fight the dust problem - one way to reduce the dust issue is to place the computer at an elevated level, like on top of a desk instead of on the floor. In industrial applications where dust is a severe problem, the solution is to create a slight positive pressure inside the case using nitrogen (I am mentioning this, not recommending this).