FYI for folks who want to do this in the future. I have this working with the following configuration:
1 - mobo hdmi out to hdmi monitor input
2 - mobo mini display port to ACTIVE mini display port to hdmi adapter then hdmi monitor
3 - mobo display port to ACTIVE display Port to hdmi adapter then hdmi monitor
They key basically is the ACTIVE adapters... passive did not work.
Not much good doc on this and Intel and ASUS support were really not helpful...