You can determine if your existing cable is adequate in one of two ways. Check if the cable is labeled as High Speed, Premium High Speed, or Ultra High Speed. If your HDMI cable doesn’t clearly specify what type it is, you might be able to look it up if the manufacturer and part number are printed on the cord.
Do HDMI cables make a difference to TV quality?
An HDMI cable only transmits signals. It doesn’t make the audio and video quality better than your TV or other devices’ capabilities.
Does it matter which HDMI cable I get?
Computers can send the maximum resolution and frame rate possible in the current HDMI spec. If you’ve got a beefy computer and want to connect to a UHD TV, it’s probably worth it to get Ultra High Speed or at least Premium Certified cables. Noncertified cables might work, but it’s less likely.