Requires a 120Hz capable DisplayPort switch. One USB-C cable to DP and the other from DP to DP. This device works fine at 120 for both laptops. I was concerned that USB-C to DP wouldn't run at 120Hz, but it does. No screen tearing. I would recommend this to anyone who needs 2 computers to share a 120hz monitor. Order a USB switch to pair with it and you've got an inexpensive KVM that works great.
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