Also AMD's Mantle increases fps in both games, but in BF4 at the cost of image quality and some people complained about stuttering as well when playing in Mantle mode, that could change in the future with better drivers. If you are ready to make this sacrifice and gamble with an AMD GPU then that is an option as well. But you won't find any cards that deliver the performance per watt that the GTX 750Ti delivers, so that could mean that a PSU upgrade maybe necessary for the AMD card adding or exceeding the cost of the GTX 750Ti card, which another thing to take into account if you ever consider that as an option.