VRAM Usage - 6970 (2 GB) vs. GTX 580 (1,5 GB) vs. GTX 580 (3 GB)

[Codex]

Originally Posted by Buchon

There a lot of confusion in this thread about how SLI/Crossfire work.

SLI/Crossfire cards and systems dont share VRAM between GPUs.

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