Well increase the resolution, refreshrate and or length of the cable and you start running into problems. I've bought 4k 120hz cables that couldn't even do 4k at 60hz. Lot's shit out there that doesn't meet spec. LTT and others did some video's on it. Once you run into limitations fibre optic is not bollocks, go over 5m with 4k@120hz and you pretty much need these.
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