I was an ATI guy now I'm only nVidia. I got on nVidia's website and found the physical dimensions of the video card I was looking to get (~10.5" long - 8800GTX) and then I contacted the manufacturer of my case (Antec 900) to get the inside physical dimensions to ensure it would fit (it was close about .5" to spare)
Now you also have to ask yourself what your motherboard supports. Do you have AGP,PCI-E, or god forbid PCI? If you have PCI-E what version? 1.0 or 2.0? These will all weigh in on your video card purchase. I'm stuck with my 8800GTX and can't upgrade to the GTX 295 until I get a new motherboard that supports PCI-E 2.0.
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