Fill rate and other GPU capabilities of the Beagle-V Ahead

Your website currently lists the pixel fill rate as 3Mpx/s, which is less than 2 fps for full 1080 HD. Is this correct? Other questions: does the HDMI support UHD 2160? Can the board support more than one display (even a small one, say through headers)? Can it boot off external media, SD, USB? Looks like a good board! Thanks!