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ok one thing to keep in mind is that when u use SLI or crossfire, you don't get to use the memory from both cards, just the GPU's.. even if u had 3 512MB videocards in your computer crossfired, u'd still only have 512mb allocatable texture memory...
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Exactly. With WHICHEVER OS you use. In CF and SLI, VRAM doesn't increase respect one only of these cards.
For example, two 5870 (1Gb per each one) cards in CF will result in 1Gb of VRAM available for the system (not 2Gb). Each GPU works with its own VRAM associated.
You cannot add them.