FPS there is no FPS limit for HDMI or most other digital outputs. The highest resolution supported by HDMI 1.3 is 2560x1600. With the release of HDMI 2.0, there will be support for 4k resolutions soon. However, if you use 2 HDMI cables to input output to 4k monitor it will still run the monitor at 60 hz. otherwise, if you use 1 HDMI cable, it will only go up to 30 hz refresh rate.