Just installed a HD Homerun Prime cable card tuner. Installed, called Comcast had them activate it, and MCE sees all installed tuners. I have 5 total. Two on a HD tuner card installed in the PC and the three new ones installed via HD Homerun Prime cable card. When I schedule 2 programs to record at the same time using HD cable channels mce reports a recording conflict and picks a different lower non hd channel to record on. It appears that it will not use the cable card tuners.