In general, it's fine, but you would need closer to 3-4GB to max out BF4. My buddy has SLi 2GB GTX 680's, and anything above medium prompts a crash and a DirectX memory error. However, it is likely more than VRAM contributing to his issue, as he is also running out of system memory. In your case, you might be able to max it out, but likely not at a constant 60FPS.