From first google link:
Under Windows 7, we experienced choppiness as we played. This was felt both in the "Test Range" map, and in multiplayer gaming sessions. The choppiness was more pronounced on the GeForce GTX 780. We could get on a straight path, in the "Test Range" and move down a straight road. As we did this, there would be a pause, or chop, in the frames randomly. It was like the game was hitching for no reason. This happened more on the GTX 780. This is under Windows 7.
When we tried this on Windows 8.1 the pausing, or hitching, or chop (however you want to describe it) was completely gone. Moving was smoother with no hitching in the game on the GTX 780. This affected both the test range and the multiplayer gaming session.
Therefore, the gameplay experience advantage under Windows 8.1 is a smoother gameplay experience in BF4 on both video cards.