My PC doesn't seem to support 4K 60Hz with UHD color. 4K 30Hz with UHD color or 4K 60Hz without UHD works fine. Not sure if these are keystone jacks, but the cable will work at 60Hz UHD 4K color when connected directly. Maybe it's sensitive. maybe it's a jack. These are pretty solid keystone jacks. You get what you pay for.
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