Okay, I know it's possible to configure cards of the same model from different manufactures in sli. Would it be possible/advisable to pair a 768mb gtx 460 with a 1gb gtx 460. I was thinking about putting a 768mb in a new system now, and then throwing in a 1gb model later when prices drop a little more. Would the system scale down the 1gb card to the 768's level and refuse to recognize the extra ram? Would it work at all?
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You can't. To sli you need same cards, same memory chips= 768 mb will not sli with 1 gb..
They won't work because they don't share the same "memory interfaces".