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HDMI cables: the essentials for sharp picture and clear sound

HDMI cables (also known as HDMI leads in the UK) carry uncompressed digital video and multi‑channel audio through a single, tidy connection. Choose the right specification for your setup: High Speed (often associated with HDMI 2.0) for 4K at up to 60Hz, or Ultra High Speed (commonly referred to as HDMI 2.1) for features like 4K at 120Hz, 8K support, HDR, VRR and eARC. If your system also uses separate audio runs—for example to legacy amps or headphones—pair your setup with complementary Audio Cables for maximum flexibility.

Why choose HDMI cables: benefits, uses and buying tips

HDMI is the universal standard for TVs, consoles, Blu‑ray players, set‑top boxes, laptops and projectors. The right cable helps you unlock:

  • Single‑cable simplicity: carry both video and audio without extra leads.
  • 4K and 8K readiness: match cable bandwidth to your display for smoother motion and better detail.
  • Better gaming and sports: higher refresh rates (e.g., 120Hz) and VRR reduce blur and tearing.
  • Home‑cinema audio: ARC/eARC returns TV sound to your soundbar or AVR without additional connections.
  • Reliable installs: choose appropriate lengths; consider active or fibre HDMI for longer runs.

Tip for value: picture quality is digital—once the required spec is met and the signal is stable, spending more does not make the image “sharper”. Focus on certification, length, build and warranty to get the best price without compromise.

Explore the HDMI cable range: specs, lengths and use cases

From short desktop links to in‑wall or projector runs, there's an HDMI cable for every scenario. Ultra High Speed HDMI cables are ideal for next‑gen TVs and high‑frame‑rate gaming; High Speed HDMI suits most 4K/60 or Full HD setups. You'll also find Mini/Micro HDMI for cameras, right‑angle connectors for tight wall mounts, and active or fibre HDMI options for longer distances. If you're connecting a high‑refresh PC monitor that favours DisplayPort, consider DisplayPort Cables as an alternative.

See also

FAQ

Which HDMI cable do I need for 4K 120Hz or 8K?

Choose an Ultra High Speed HDMI cable (often associated with HDMI 2.1). It supports the bandwidth required for 4K at 120Hz and 8K at 60Hz, plus gaming features like VRR and ALLM. For 4K at 60Hz, a High Speed HDMI cable (HDMI 2.0 era) is usually sufficient.

Are cheap HDMI cables reliable, and how do I get the best price in the UK?

Yes—if the cable meets the correct spec and is certified. Picture quality won't improve beyond that, so focus on the right spec, length, build and warranty. To get the best price in the UK, avoid over‑length runs, buy only the features you need (e.g., eARC if required), and look for certification labels rather than luxury finishes.

Do I need an 8K HDMI cable for a 4K TV?

No. A High Speed HDMI cable is typically fine for 4K at 60Hz. If you want 4K at 120Hz, future‑proofing, or eARC robustness, step up to an Ultra High Speed HDMI cable.

What's the difference between High Speed (HDMI 2.0) and Ultra High Speed (HDMI 2.1) cables?

  • Bandwidth and features: Ultra High Speed supports higher frame rates (e.g., 4K/120), 8K, VRR and often eARC stability.
  • Use cases: High Speed suits 4K/60 streaming and movies; Ultra High Speed is best for high‑frame‑rate gaming and premium setups.

Which HDMI cable should I use for ARC/eARC soundbars?

For ARC, a High Speed HDMI cable with Ethernet usually works. For eARC and top‑tier audio formats, an Ultra High Speed HDMI cable is recommended for better robustness.

How long can an HDMI cable be without losing signal?

Up to around 3–5m is typically straightforward for passive cables. Beyond that, use high‑quality passive, active or fibre HDMI to maintain stability, especially for 4K/120 or long projector runs.

Is HDMI or DisplayPort better for high‑refresh gaming monitors?

Many PC monitors favour DisplayPort for very high refresh rates, while HDMI 2.1 handles 4K/120 on modern TVs and some monitors. Check your display and GPU specs; if DisplayPort is preferred, explore dedicated DisplayPort Cables.

Frequently Asked Questions

Which HDMI cable do I need for 4K 120Hz or 8K?
Choose an Ultra High Speed HDMI cable (often associated with HDMI 2.1). It supports the bandwidth required for 4K at 120Hz and 8K at 60Hz, plus gaming features like VRR and ALLM. For 4K at 60Hz, a High Speed HDMI cable (HDMI 2.0 era) is usually sufficient.
Are cheap HDMI cables reliable, and how do I get the best price in the UK?
Yes—if the cable meets the correct spec and is certified. Picture quality will not improve beyond that, so focus on the right spec, length, build and warranty. To get the best price in the UK, avoid over-length runs, buy only the features you need (for example eARC), and look for certification labels rather than luxury finishes.
Do I need an 8K HDMI cable for a 4K TV?
No. A High Speed HDMI cable is typically fine for 4K at 60Hz. If you want 4K at 120Hz, future-proofing, or eARC robustness, step up to an Ultra High Speed HDMI cable.
What’s the difference between High Speed (HDMI 2.0) and Ultra High Speed (HDMI 2.1) cables?
Ultra High Speed supports higher bandwidth and features such as 4K at 120Hz, 8K, VRR and often improved eARC stability. High Speed suits 4K at 60Hz streaming and movies, while Ultra High Speed is best for high-frame-rate gaming and premium setups.
Which HDMI cable should I use for ARC/eARC soundbars?
For ARC, a High Speed HDMI cable with Ethernet usually works. For eARC and top-tier audio formats, an Ultra High Speed HDMI cable is recommended for better robustness.
How long can an HDMI cable be without losing signal?
Runs up to about 3–5 metres are typically straightforward for passive cables. For longer distances or higher bandwidth needs (such as 4K 120Hz), consider high-quality passive, active or fibre HDMI solutions to maintain stability.
Is HDMI or DisplayPort better for high-refresh gaming monitors?
Many PC monitors favour DisplayPort for very high refresh rates, while HDMI 2.1 handles 4K at 120Hz on modern TVs and some monitors. Check your display and GPU specifications to choose the best interface for your use case.