I know this post is a few months old, and you’ve probably solved this problem, but came across this,,and I’ve just ordered an Intensity Pro, and was doing some reading.
You can’t output 1080 60p over hdmi, as (as far as I know) there currently isn’t a display that can playback 1080 60p footage. If your monitor is asking for 60hz, that is a refresh rate, and not a frame rate. Digital displays were 60hz for a long time, and they last few years have been changing. LCD tvs are now at 120hz, and 240hz, and I think plasma tvs are at 600hz (notice all multiples of 60)