Almost every modern device today connects to a screen using an HDMI cable, but that does not mean that every HDMI cable can transmit 4K resolution. If a 4K TV or monitor is used, a cable with the appropriate HDMI version and sufficient data flow is necessary. The good news is that it can be checked relatively easily, if you know what to look for.
The most reliable indicator is located directly on the cable or its packaging. Labels like High Speed HDMI, Premium High Speed HDMI or Ultra High Speed HDMI guarantee support for 4K resolution, but with different maximum refresh rates. Some manufacturers additionally list technical details such as 4K @ 60Hz, 18 Gbps, HDMI 2.0 or HDMI 2.1, which clearly indicates that the cable can support a 4K signal.
Another way of checking is a practical test. It is enough to connect a device that supports 4K output, such as Apple TV or PlayStation 5, and enter the image settings. Only those options that the HDMI connection really supports will be offered in the resolution selection menu. If 4K resolution 3840×2160 does not appear in the list, it means that the cable or some other link in the chain does not meet the requirements. In practice, if the screen is 4K and the signal is not, an old HDMI cable is the most common cause of the problem.
Why HDMI cable type matters for 4K
The HDMI standard is constantly evolving. HDMI 1.4 was technically able to transmit a 4K signal, but only at 30 Hz, which is not enough to display the image smoothly. 4K at 60 Hz requires at least HDMI 2.0, while HDMI 2.1 brings support for even higher frequencies, as well as 8K resolution. This is especially important for gaming, as a lower refresh rate directly affects a higher response delay.
The reason older HDMI cables can’t handle 4K at higher frequencies lies in bandwidth. HDMI 1.4 is limited to around 10 Gbps, which is not enough for a 4K signal at 60 Hz. Newer standards offer a significantly higher data flow, which allows for higher resolution, better color and a more fluid display. Although the resolution is not the only factor in enjoying the content, using the appropriate HDMI cable allows you to get the most out of your existing equipment, advises BGR.