You're shopping for a new TV, console, or AV receiver and the spec sheets keep mentioning HDMI 2.1. Do you actually need it, or is HDMI 2.0 good enough? The answer depends on what you plan to watch and play. Here's a plain comparison of the two, plus what it means for the cable you buy.
HDMI 2.1 vs. 2.0: Quick Comparison
| Feature | HDMI 2.0 | HDMI 2.1 |
|---|---|---|
| Maximum bandwidth | 18 Gbps | 48 Gbps |
| 4K | Up to 60 Hz | Up to 120 Hz |
| 8K | Not supported at full quality | Up to 60 Hz (with compression, higher) |
| HDR | Static HDR (HDR10) | Dynamic HDR (scene-by-scene) |
| Variable Refresh Rate (VRR) | Limited / not part of the base spec | Yes |
| Auto Low Latency Mode (ALLM) | No | Yes |
| eARC (lossless audio return) | Not required | Yes |
| Cable required | Premium High Speed | Ultra High Speed |
What Is Actually Different?
More Bandwidth
HDMI 2.1 moves from 18 Gbps to 48 Gbps. That extra headroom is what allows 4K at 120 Hz and 8K video, and it is why cable quality matters more than ever.
Higher Refresh Rates
If you game on a PS5, Xbox Series X, or a modern PC, 4K at 120 Hz delivers noticeably smoother motion. HDMI 2.0 tops out at 4K 60 Hz.
Gaming Features: VRR and ALLM
Variable Refresh Rate syncs your display to the frame rate of the game to reduce tearing and stutter. Auto Low Latency Mode switches your TV into game mode automatically when a console is detected.
Dynamic HDR
Instead of one set of HDR settings for the whole movie, dynamic HDR can adjust brightness and contrast scene by scene or frame by frame.
eARC
Enhanced Audio Return Channel lets your TV send lossless, high-bitrate audio to a soundbar or receiver over a single HDMI cable.
A Note on HDMI Version Names
HDMI version labels can be confusing. Some products labeled "HDMI 2.1" don't support every 2.1 feature, and the HDMI Licensing Administrator encourages manufacturers to describe features instead of version numbers. When you shop, check the specific features you need, such as 4K 120 Hz, VRR, or eARC, rather than relying on the version alone.
Do You Need HDMI 2.1?
You Probably Need It If:
- You game on PS5, Xbox Series X|S, or a PC and want 4K at 120 Hz
- You want VRR to reduce screen tearing
- You're buying a high-end TV or an 8K display
- You want eARC for lossless audio to a soundbar or receiver
HDMI 2.0 Is Fine If:
- You mostly stream movies and shows in 4K at 60 Hz or lower
- You use a Blu-ray player, cable box, or streaming stick
- Your TV and source devices don't support 4K 120 Hz or VRR
Which HDMI Cable Do You Need?
A fast TV and console only work at full quality if the cable can handle the bandwidth. For HDMI 2.1 features, look for a cable labeled Ultra High Speed, which is certified for 48 Gbps. For 4K at 60 Hz and HDR, a Premium High Speed cable is enough.
Distance matters too. At 48 Gbps, passive copper cables are reliable only over short runs. For longer distances, an Active Optical HDMI cable keeps the full bandwidth over fiber. Read our guide on how long an HDMI cable can be to see the limits.
Frequently Asked Questions
Is HDMI 2.1 backward compatible with HDMI 2.0?
Yes. HDMI 2.1 devices and cables work with HDMI 2.0 devices, but you only get the features that both ends support.
Will an HDMI 2.1 cable improve my picture on an HDMI 2.0 TV?
No. The TV is the limit. A better cable won't add features your TV or source doesn't support, though it will ensure you aren't losing quality to a weak cable.
Can I get 4K 120 Hz over an older HDMI cable?
Not reliably. 4K at 120 Hz needs the bandwidth of an Ultra High Speed cable.
Shop HDMI Cables for Every Setup
Ready to match your cable to your TV and console? Browse our HDMI cable collection, or see our Active Optical HDMI cables for long, high-bandwidth runs.