Re: GPU memory question
Arma 3 maxed in Surround you're looking at a high end setup. A 4GB 680 or 7970 Boost. The problem with Surround is not only do you need copious amounts of VRAM but also the GPU horsepower to back it up. If your 6870 was something a little better I would say grab another one, but I'm 99% positive 6870 Crossfire won't do what you're asking.
To give an example, my GPU setup had some problems with 1080p Surround on certain games.
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