Can you SLI two different versions of the 670 (regular and FTW+)? I would assume so because they're the same GPU and stuff, just one has been OC'd by default and has 2x the VRAM, but I want to just make 100% sure before I whip out $350 for a 2nd card.
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Yes you can.
How will the memory be distributed? I assume they both have the same speed.