Official Battlefield 4 System Requirements

Wouldnt worry, the 690 uses it's vram set up differently to sli cards, and even in games like Crysis 2 with heavy mods that go over 2gb of vram, my 690 eats it up, max payne 3 allows for the highest setting requiring 3gb or vram, and skyrim can be fully modded out with insane amounts of vram usage and still be fine. 

The 690 matches 7990 with it's higher vram and even outperforms  titan with 6gb of vram upto crazy high resolutions . No worries your card wont handle game