A:AnswerHello,
Unfortunately we are unable to provide specific FPS information as that is dependent on your in game settings. We do not run benchmarks on these systems which is why those graphics are not included.
A:AnswerHello,
The power supply should have room for those 3 parts, but we would recommend waiting for the computer to arrive to double check before you purchase those parts.
A:AnswerHello,
This system will have at least 3 ports on the GPU. The reason only 2 ports are listed in the specifications tab are because sometimes certain GPU models will only have 1 HDMI port of 1 DP, but two of the other.