What HDMI cable do you actually need?
For almost everyone the answer is a Premium High Speed cable, and you very likely already own one in the box of your TV or console. The costly ones do nothing a cheap certified one does not. Here is exactly which cable matches what you are trying to do, and where the only real upgrade actually matters.
The short answer
HDMI cables come in a few tiers, and the label on the packet is what counts, not the price:
| Cable | Bandwidth | Handles up to |
|---|---|---|
| High Speed | 10 Gbps | 1080p, and basic 4K at 30Hz |
| Premium High Speed | 18 Gbps | 4K at 60Hz with HDR |
| Ultra High Speed | 48 Gbps | 4K at 120Hz, 8K, VRR |
Match the cable to the job
- Watching 4K films and TV (4K at 60Hz, HDR): A Premium High Speed cable (18 Gbps, HDMI 2.0) is all you need, and it is what shipped with most 4K gear. This covers the vast majority of people.
- Gaming at 4K 120Hz on a PS5 or Xbox Series X, or using VRR: This is the one case that needs the newer Ultra High Speed cable (48 Gbps, HDMI 2.1). Anything less caps you at 60Hz.
- Just 1080p: Almost any working HDMI cable, including old ones, is fine.
Why expensive cables are a waste
HDMI is a digital signal, so it either arrives complete or it does not. A cable cannot make the picture "richer" or the color "deeper"; those are decided by the TV and the source, not the wire. A certified cable at a few pounds carries exactly the same signal as one at seventy. If a cheap certified cable shows a clean picture, a dearer one shows an identical picture. The only thing you are paying extra for is the jacket.
The port matters as much as the cable
Here is the catch that trips people up: The cable is only half of it. On many TVs, only one or two of the HDMI ports actually support the full HDMI 2.1 features, and the rest are slower. If you plug a 4K 120Hz console into the wrong port, you get 60Hz no matter how good the cable is. Check the labels by the ports, or the manual, and use the port marked for 4K 120 or 2.1. The same applies to eARC for a soundbar, which lives on one specific port.
Length and troubleshooting
Over short runs, a couple of metres, a passive cable is reliable. Past about five metres, especially for 48 Gbps signals, look for a cable rated as active or optical, or the picture may drop out or sparkle. If a working setup suddenly loses its signal, swapping the cable is a fair first test, but a dropout is as often a loose plug or the wrong port as a bad wire.
Questions people ask
Do I need a special HDMI cable for 4K?
For 4K at 60Hz with HDR, which is normal TV and film viewing, a Premium High Speed cable (18 Gbps) is enough, and it usually comes in the box. You only need the pricier Ultra High Speed (48 Gbps) cable for 4K at 120Hz or VRR gaming.
Does an expensive HDMI cable give a better picture?
No. HDMI is digital, so a certified cable either passes the full signal or it does not. A cheap certified cable and an expensive one produce an identical picture. Price buys a nicer jacket, not a better image.
Why is my TV only showing 60Hz with a 120Hz console?
Usually the port, not the cable. On most TVs only one or two HDMI ports carry the full 4K 120Hz (HDMI 2.1) signal. Move the cable to the port labelled for 4K 120 or 2.1, and make sure the cable itself is an Ultra High Speed one.
To see which resolutions, refresh rates and HDR formats your set reports, run the TV Capability Test. If you game, the best TV settings for gaming guide covers Game Mode, VRR and the rest.