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

[Buchon]

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

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

So the effective VRAM of a dual GPU with 2 GB is what is assigned to a one GPU.

That mean that in a dual GPU card with 2 GB of VRAM there a 1 GB of effective VRAM becouse, in fact this card are two single cards of 1 GB VRAM.