Home › Forums › CAC-1170: 4k 60Hz Finally working with 2014 15″ Retina Macbook Pro and Vizio M50-C1 › RE: CAC-1170: 4k 60Hz Finally working with 2014 15″ Retina Macbook Pro and Vizio M50-C1
Step 3: Once restarted, check in SwitchResX preferences to see if the custom resolution has been installed. If so, connect Macbook Pro to the M50-C1 (or other M series) to HDMI Port 5 using the CAC- 1170 and HDMI cable (18Gbps capable). Use SwitchResX to change the resolution to either 1080p @ 60Hz (HIDPI aka Pixel doubled) or 3840 x 2160 @ 60 hz (native res). Hold your breath and it should let you finally use your Vizio M series at 4k 60hz. Check refresh rate by using the UFO test (www.testufo.com/#test=framerates)