How to choose an HDMI cable based on resolution, distance, and actual use

Not all HDMI cables are created equal. A short cable for a Full HD office monitor doesn't have the same demands as a long cable for a projector, a 4K 120 Hz console, or a hidden audiovisual installation. Choosing wisely avoids the classic "no signal," flickering, loss of HDR, or having to repurchase.

The key is to cross-reference three pieces of data: resolution, refresh rate, and distance. From there, you can decide whether a standard HDMI cable is sufficient, if HDMI 2.0 is advisable, if you need HDMI 2.1, or if the length necessitates an active or fibre optic cable.

1. Resolution and Hz: The First Things to Look At

For Full HD, almost any modern, quality HDMI cable works. For 4K, it's worth checking if the cable supports 4K at 60 Hz. For 8K or 4K at 120 Hz, especially with current consoles and modern graphics cards, look for HDMI 2.1 / Ultra High Speed.

• Full HD 1080p: basic use, office, older players.
• 4K 30 Hz: presentations, simple TVs, some USB-C to HDMI adapters.
• 4K 60 Hz: 4K TVs, monitors, current players.
• 4K 120 Hz / 8K: gaming, PS5, Xbox Series, powerful PC, HDMI 2.1.

2. Distance: The Silent Enemy of HDMI

An HDMI cable of 1–3 metres is usually straightforward. Beyond 5 metres, it's advisable to choose better quality. Above 10 metres, especially with 4K, I wouldn't buy "any cable." For 15, 20, 30 or more metres, active or fibre optic HDMI cables are usually the most stable solution.

In installations for projectors, meeting rooms, shop windows, or screens far from the computer, distance is paramount. A long passive cable may work in a quick test and then fail with HDR, 60 Hz, or when certain equipment is turned on.

3. Actual Use: TV, Console, Monitor, or Projector

For a normal 4K TV, a quality HDMI 2.0 may be sufficient. For current gaming, buy with HDMI 2.1 in mind if you want 4K 120 Hz, VRR, or greater futureproofing. For projectors, check actual distance and resolution. For PC monitors, DisplayPort is sometimes a better option, especially at high refresh rates.

4. Active HDMI, Fibre Optic, and Extenders

When the run is long, you have three paths: active HDMI cable, fibre optic HDMI, or an HDMI extender over network cable. Active and fibre cables are usually directional: there's a source end and a display end. If installed in reverse, they won't work.

Extenders over Cat6 are useful when network cabling already exists or when you need to run through complex conduits, but you must check maximum resolution, power supply, and latency.

Common Mistakes

• Buying by "HDMI" without checking version, resolution, and Hz.
• Using a long passive cable for 4K and expecting perfect stability.
• Installing an active or fibre cable in reverse.
• Confusing an HDMI splitter with an HDMI switch.
• Not checking if the USB-C adapter actually outputs video.

Before Buying: Three Quick Questions

The first question is what resolution and refresh rate you need today. The second is what the actual length of the cable will be, following the path along the wall, conduit, or furniture, not the straight-line distance. The third is whether the installation will be visible or hidden: if it's going through a false ceiling or pipe, it's advisable to buy correctly the first time.

Also check for special connectors. Mini HDMI and Micro HDMI are not the same as standard HDMI; they appear in cameras, tablets, capture cards, and some compact equipment. If you're buying remotely, a photo of the port prevents errors.

What to Buy According to Your Case

If you're just connecting a TV and set-top box at 1–2 m, choose a quality HDMI cable of the right length. For a gaming console or PC, use a certified HDMI 2.1. For a projector at 10 m or more, consider an active HDMI or fibre optic. For professional installations, calculate the path before buying and avoid unnecessary splices.

See products: HDMI cables, adapters, splitters, and extenders. If your equipment uses a PC/monitor, you might also be interested in DisplayPort.

Quick Guide by Scenario

• Nearby 4K TV: HDMI 2.0/2.1 of 1–3 m, depending on features.
• PS5, Xbox, or Gaming PC: Certified HDMI 2.1 if you seek 4K 120 Hz.
• Projector at 10–20 m: consider active HDMI or fibre optic.
• Meeting Room: prioritise robustness, actual length, and accessible connectors.
• Hidden Installation: buy with margin; changing the cable later costs more.

If you're torn between two cables, choose the one that covers reasonable future use. It's not necessary to oversize everything, but it is important to avoid the typical cable that works at 1080p and fails precisely when activating 4K, HDR, or 120 Hz.

Frequently Asked Questions

Do I need HDMI 2.1 for a 4K TV?

Not always. For 4K 60 Hz, HDMI 2.0 may suffice. For 4K 120 Hz, VRR, or 8K, HDMI 2.1 is the correct choice.

Why does a long HDMI cable result in a black screen?

It could be signal loss due to distance, low cable quality, excessively high resolution, or an active cable installed in reverse.

Is HDMI or DisplayPort better?

For TVs and consoles, HDMI is usually standard. For PC monitors with high refresh rates, DisplayPort may be more convenient.

Does an expensive HDMI cable always improve the picture?

Not by itself. Digital signals either work or they don't. What's important is that the cable supports the resolution, Hz, distance, and functions you need. For long runs, it is advisable to invest in quality, active, or fibre options.