[madrebel]

Originally Posted by Codex

That's not entirely true. It depends on how the developer has set up the buffers in DirectX. While yes they physically don't share memory, but with DirectX you can map the memory to appear as one huge chunk.

http://msdn.microsoft.com/en-us/libr...=vs.85%29.aspx

no, you can't. each GPU has X memory. gpu1 can't access gpu2's memory. if GPU2 even wanted to access GPU1's buffer then this would slow down the frame draw process which is why it isn't done.