Originally Posted by sniggleface
I'm willing to bet it's because BF3 rarely uses 100% of your GPU. The game is extremely CPU limited, even with high overclocking. You can verify this by keeping the Afterburner (or similar app) hardware monitors active/logging while playing the game.
While Battlefield 3 is a CPU-intensive game indeed I'm sure that my CPU isn't the bottleneck there. I have tested the game at 800x600 at low settings and my i7 2700K@4.5GHz dipped to 100FPS several times but 90FPS being the lowest.
When I play Battlefield 3 my GPU-usage is around 95% but spikes a 99% at times and I think that has to do with the fact that I cap my FPS at 120FPS because I don't want any screen tearing due to a too high framerate.
Even when I play Battlefield 3 with my overclock at 1228MHz/7GHz my FPS dips to 70FPS at times so I'm definitely limited by my GTX 780.