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I recently purchased a Samsung CRG9 to use with my 2017 iMac. The Mac has thunderbolt 3 via USB C connectors. I tried using a USB C to HDMI adapter and it was a nightmare. It had display issues (pink screen) and wouldn't wake from sleep, had to constantly play with the settings and unplug/replug. This cable fixed it all. The monitor gets the full resolution, and it wakes from sleep. Build quality seems good as well. Highly recommend this cable if you are in a similar situation.