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

[adonys]

I don't know for sure, but dual GPU cards might have their memory shared (like in they both can access it all, so the data can be loaded through all memory, not separated for each GPU in its own memory). I need to check this.

yet, I would say do not buy no new hardware at least 1 month from now on. there's no point in doing it without knowing the engine's behavior after the few initial optimization patches.