If I buy a pci e 3.0 card, like a hd radeon 7770, would it work with my pci e 2.0 motherboard? I know if it does work then it still won't work as well as if I had a 3.0 motherboard, I'm just wondering if it's possible for a 3.0 card to work in a 2.0 motherboard.
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yes, they are backwards compatable
Yes the cards will work , they are backwards compatable with the Pci-e 2.0 slots. You are correct in that they will only work to thier full potential in a 3.0 slot but they will give very good performance in the 2.0 slot.