Soldato
Aside from the links already provided and a ton of feedback from people using 2gb cards on various forums around the web and on battlelog. (yes i know )
I have here some benchmarks where the 2gb limit was not exceeded but resulted in the problems i mentioned above. Given the demands of bf4 its easily possible to see this behaviour happening again with much higher vram usage.
HardOCP also posted something exactly like this regarding Hitman Absolution. Can't remember the link but it showed exactly the same as Swe clockers and pcper's conclusion.
Yes, but look at the FPS though - it's nearly identical...
As for the frame time comparison - after I was told my 7950 CF set up was unplayable before due to frame times and it was fine I tend not to really give it much time .
Again, they offer no technical reasons as to why the difference is there. It's guess work.