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I was talking about the 5970.
All true, the difference being once you add a 5970, you go from a single card being read as 2gb, to 4 cores read as 1gb each. Perhaps the difference I'm seeing isn't entirely down to that one factor, what I can say is that a single 5970 runs considerably better than disabling one of the cards. There could well be more at play, which is something I never worked out and is why I got rid of one of the cards. One of the problems I was having was the memory restrictions on certain games, GTA IV, Operation Flashpoint DR, both restrict video settings based on gpu memory and now both read 2gb of memory and run better with higher allowed settings.Comments still stand.
AFAIK a 5970 NEVER has 2GB VRAM for use on a single GPU. If Xfire is not working you just get 1GB VRAM and one GPU idle.
A 5970 is identical to 2*5870's on a single PCB (just downclocked). So the same limitations apply. You can't reuse the other VRAM on a single GPU core.
