Question: do you need a 4k hdmi cable to get 4k?
Answer: You do not need a new HDMI cable for Ultra HD 4K (probably). We're well into the transition to Ultra HD "4K." Most mid- and high-end TVs are now Ultra HD resolution, with many also supporting HDR. Not surprisingly, cable manufacturers are jumping at the chance to sell new and more expensive "4K" HDMI cables.