Yeah I am now 0/3 on hdmi cables for 240hz vrr, the giotek one recommended here had a few dropouts, and two local official hdmi 2.1 ones which were thicker and shorter one was ok for a bit. One was really bad even tho was still "certified" with the holographic sticker and all.
I now moved my comp on the desk and am using the included micro to hdmi super short cable. So far so good but too soon to say. If it lasts a week+ I will be happy but again if i drop to 120hz i can even use a dingy old 2.0 cable and it works no issues for 2+ weeks. My brain....
Also included displayport which I tried first had some artifacting in hdr in some games...
I'm able to run my windows desktop at 240Hz but if I've gamed at those frequencies it wasn't in 4K. Do you have a card capable of that?
4K @ 190Hz is a little over 50 Gbps, so you'd need a cable that was rated for higher than that. My fiber display port cable is rated for 32 Gbps so even that wouldn't be able to supply the required data rate.