Question: I want to use 2  pci express graphic cards, is there any compalibility should i consider? I have one GeForce 6600GT PCI Express card and a mainboard with PCI Express slot, and I want to buy another PCI Express graphic card, do I need to buy the same type or I can buy a higher version of graphic card?

Answer: It has to be the same chip on both video cards .... the manufacturer shouldnt matter, be it eVga, XFX, BFG but make sure they are both 6600GT
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