Review on TESmart 4K@60Hz Ultra HD HDMI KVM Switch, 2x1, 3840x2160@60Hz 4:4:4, with 2 Pcs 5ft KVM Cables, Supports USB 2.0 Devices, Control up to 2 Computers/Servers/DVR (Black) by Charles Mathews

This product claims it can play 3840 x 2160 @ 60Hz 4:4:4. All of the cables that came with it, as well as the cables I previously had, had the same result: an occasional black screen while gaming. I've seen this before, it's coming from an HDMI cable that can't transfer enough data. I bought a better cable than this happened before and the problem was solved. The problem now is that this device is in between my good cable and another good cable and this problem occurs again. The solution seems to be to use my displayport on my graphics card and then use a DP to HDMI converter. The color profile is set to RGP constraint. Picture quality seems good, but I'm pretty sure it's the 4:2:2 equivalent. Maybe even using the HDMI output will work fine with the actual ycbr profile set to 4:2:2. The laptop I share a keyboard and mouse with had no setup issues. It's really nice that you can now double-tap the scroll lock button and then scroll up and switch views.