I have a Nvidia 550gtx-ti cyclone II GDS. im looking to buy a custom gaming pc with a single 550 ti or 560 ti. do i need the exact same model (of video cards) to run sli mode? or is it possible to run a 560 and a 550 in sli mode? Any tips of suggestions would be greatly appreciated as Diablo 3 nears release i need to get my comp asap!

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