2 GB of VRAM simply doesn't cut it in this game. No matter how many other settings I lower, I always run into the VRAM limit on my 770 when choosing High or Very High textures. My frames are rarely an issue, but massive stuttering happens when running into the VRAM max.
It's really a shame. We're in the era of 3-4 GB being the minimum for VRAM - not recommended or ultra spec. It also sucks that 4 GB cards have only recently become a thing (with some exceptions) and the prices have only now become affordable. I hate buying future proof on cards because it tends to get very expensive, very fast. It's also my fault for not thinking ahead, but jesus. I didn't expect to hit such a brick wall in this game and have to lower the textures down to something that looks 360/PS3 (dare I say PS2?) level. It's an open world game and that's gonna chew VRAM, but come on.
Guess we'll see how The Witcher 3 fares. I'm expecting more disappointment.
EDIT: Also I didn't run into this problem with AC Unity. It hits video memory pretty hard too, though I was at least able to run High textures with minimal/no stuttering. Then again, it's not as big as GTA and probably not streaming a comparable variety of texture data. Still looks better and runs better!