Regular HDMI cables can handle 4K resolution, but they aren't able to transfer data fast enough for some of the newer 4K TVs on the market. To get the most out of your 4K TV, you'll need to invest in an HDMI 2.1 cable. These cables are designed for high-speed data transfer, and they'll be able to handle anything your 4K TV can throw at them. While they're more expensive than regular HDMI cables, they're worth the investment if you want to get the most out of your 4K TV.