How to determine whether the HDMI cable on your hand supports 4K resolution? You can follow Xiaobian to see from the following aspects：
(1)If HDMI2.0 and above are clearly marked on the cable packaging, then 4K resolution is usually supported. The HDMI1.4 version can also support 4K, but the refresh rate is only 30HZ, which is not suitable for some scenes with high fluency requirements; HDMI2.0 version can also support 4K60HZ video transmission, can provide a smoother picture; The HDMI2.1 version supports more powerful performance, which can meet higher specifications such as 4K 120HZ and 8K60HZ video transmission.
(2)Some packages may carry the label "High Speed HDMI" because 4K resolution video data is large and requires higher transmission speeds. If the cable has passed the relevant certification of the HDMI Association, it can be basically determined that it can support 4K resolution transmission. The certified cables undergo more rigorous testing, including tests at up to 18Gbps bandwidth on 4K/60p, HDR signals, and enhanced noise resistance.
(3)In general, HDMI cables that support 4K resolution will be relatively thick, and the thicker internal core can reduce resistance and reduce signal attenuation. At the same time, the cable will have a better shielding layer, such as a metal braided shielding layer or aluminum foil shielding layer, which can effectively prevent electromagnetic interference and ensure the integrity of the signal.
Devices can be connected for testing. First set the display parameters and connect the HDMI cable to a device that supports 4K resolution, such as a 4K monitor, 4K TV series or 4K player. Then in the display Settings of the device, set the resolution to 4K (3840*2160), the refresh rate to the appropriate value (try 60HZ or higher if the device supports it), and the color to full RGB.
If the cable can normally transmit 4K resolution video signals, then the screen will display a clear and accurate image, without problems such as flower screen, flicker, color distortion. If these problems occur, the cable may not support 4K resolution or there are other faults.
