New drivers are awesome lads don't miss them!
Made me play Metro Last Light on 7680x1440 and BF3 is butter smooth!
Oh yah did a quick test (Gamed a few hours) on Far Cry 3, BF3 and Metro.
Metro = 2GB max
BF3 On Casbian...
Problem is I had 7950s with the same memory interface on these screens and I never had memory issues.
That memory bandwidth makes up for some serious vram usage.
A game might max Vram but you will not get any performance drop.