What kind of expansion slot should you use for your video card?

Best eGPU Enclosures gpu slot width GPU Chipset Manufacturer Memory Size Cooler Max GPU Length Form Factor Interface Memory Interface DisplayPort HDMI Slot Width Single Slot gpu slot size Memory Speed x Bus Width 8 = Bandwidth So if my graphics card has a bus width of 256 bits and memory speed was 900MHz on a GDDR3:

gpu expansion slot GPU Chipset Manufacturer Memory Size Cooler Max GPU Length Form Factor Interface Memory Interface DisplayPort HDMI Slot Width Single Slot