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Old February 3, 2010, 07:22 AM
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Caldezar Caldezar is offline
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I'm pretty sure the rule is that the generation needs to be the same for the cards. (First 2 digits match) So you could XFire a 4850 and a 4870, but not a 4770 and a 5770. (Someone correct me if I'm wrong.)

However you wouldn't want to XFire them even if you could. XFire sets both GPU's to the lowest common denominator. Meaning the higher GPU will clock down to match the lower GPU. That's why you never see matches like a 4890 and a 4850, because the 4890 would get dumbed down to match the lower card... making it better off on it's own.
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