Using a DP-HDMI cable rated to carry UHD (3840X2160 @ 60Hz res), have tried 2x, Insignia 43" UHDs, 1x, TCL, 1x Samsung. None will run UHD @ 60Hz. They either switch to 30 Hz when "save change" or won't run UHD at all (the TCL). However my LG TV does run as monitor @ 60Hz from the same set up. The obvious solution is go get an LG TV for monitor... DUH! But that won't work for me as having 2 LGs in the same room has them both responding to the remote at the same time when only one responding is desired. Any suggestions?