R9 290X seems to be the kicking ass at 1440p / 1600p .
http://translate.googleusercontent....g=ALkJrhiWWQepuO7f56jCqpb44ooyh4XQQA#pagehead
BF4 multiplayer Siege of shangai
"SweClockers performs traditional measurements of frame rate with Fraps software. In Battlefield 4 is about honest multiplayer on Conquest Large variant of the map "Siege of Shanghai", where the testing is repeated at least three times for each configuration and tuning for a period of 180 seconds - a total of nine minutes or more.
In the test, two resolutions: 1920 x 1080 and 2560 x 1440 pixels, that is the most common levels of screens in sizes 23 to 24 inch and 27 inch. All video cards tested in the lower resolution, but selected models from the past generations even a game in the most demanding configuration."
http://www.techspot.com/review/734-battlefield-4-benchmarks/
BF4 singleplayer Singapore mission
"We tested the single player portion of the game to ensure consistent results -- something we simply can't do with others. We'd need a bunch players to participate in simulating a multiplayer environment for the benchmark and they'd all have to perform the same exact actions hundreds of times. We could have tested a multiplayer map by ourselves, but that would have likely been less demanding than single player."
We settled on the start of the fourth mission (titled "Singapore") which begins on the US vessel Valkyrie as the team walks to an inflatable rib where they have a brief discussion and then jump in before being lowered down. Although the test takes place in the Valkyrie's launch bay, the scene seems to use a lot of GPU and CPU power. There is heavy use of DoF (Depth of Field) here so perhaps that is what taxes the GPU."