I guess the mdp-hdmi adapter requires SST? Are the DP monitors you’ve tried set to MST? The Apple document at says that the MacBook Pro (Retina, 15-inch, Late 2013) is supposed to be able to do 4K at 60 Hz using MST. The 15 inch MacBook Pro Late 2013 has Thunderbolt 2 ports which are supposed to support DisplayPort 1.2. Maybe the patch can fix this case, or maybe a different patch could be made… 4K at 60 Hz requires 533 MHz which may be beyond the capabilities of the port. The patch I linked was originally for removing a 165 MHz pixel clock limit for HDMI to allow resolutions higher than 2K at 60 Hz. It could be that the Windows graphics driver has the same incorrect limitation as the Mac graphics driver or maybe the port just doesn’t support 4K at 60 Hz.
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