HDMI 2.1 explained: do I need it?
Short answer
You need HDMI 2.1 if you want to play on a PS5, Xbox Series X or gaming PC at 4K and 120 Hz with variable refresh rate (VRR). For films, streaming and TV, HDMI 2.0 is enough. Check that both your TV port and the cable support HDMI 2.1.
What HDMI 2.1 adds
HDMI 2.1 raises the bandwidth to up to 48 Gbit/s. That is enough for 4K at 120 Hz and even 8K, plus gaming features that make play smoother and more responsive.
- 4K at 120 Hz (or 144 Hz on some TVs) for smoother games
- VRR: the TV matches the game's frame rate, so no tearing or stutter
- ALLM: the TV switches to game mode by itself
- eARC: lossless Dolby Atmos from the TV to a soundbar
When HDMI 2.0 is enough
For films, series and streaming at 4K and 60 Hz, HDMI 2.0 is all you need. Netflix, Disney+ and Blu-ray players do not use 120 Hz. The Nintendo Switch 2 also outputs 4K at 60 Hz on TV, which HDMI 2.0 handles.
Watch out for this
Many TVs only have two HDMI 2.1 ports, and one of them is often the eARC port for the soundbar. Use an Ultra High Speed HDMI cable, recognisable by the certification label on the packaging.
| Use | HDMI 2.1 needed? |
|---|---|
| PS5 or Xbox Series X at 4K 120 Hz | Yes |
| PC gaming above 60 Hz at 4K | Yes (or DisplayPort on monitors) |
| Streaming and Blu-ray | No |
| Soundbar with lossless Dolby Atmos | eARC (part of HDMI 2.1) recommended |
| Nintendo Switch 2 | No, 4K at 60 Hz works with HDMI 2.0 |
Questions and answers
Do I need a special cable for HDMI 2.1?
Yes. For 4K at 120 Hz use a certified Ultra High Speed HDMI cable. Older High Speed cables often cause flickering or black screens.
Is HDMI 2.1 the same as eARC?
No. eARC is one feature of HDMI 2.1 for sending audio to a soundbar or AV receiver. A port can support eARC without offering 4K at 120 Hz.