HDMI 2.1 vs 2.0: Specs, Resolutions, and Differences (2026)
HDMI 2.1 nearly tripled the available bandwidth over HDMI 2.0 and unlocked 8K @ 60Hz, 4K @ 120Hz, and a stack of new gaming features. This guide compares the two versions side by side — specs, resolutions, refresh rates, and what you need to actually use HDMI 2.1.
HDMI 2.1 max resolution and refresh rate
HDMI 2.1 supports up to 10K @ 120Hz, 8K @ 60Hz, and 4K @ 120Hz with full HDR. At 1440p, the maximum refresh rate is up to 240Hz; at 1080p it can reach 240Hz or higher with Display Stream Compression. The 48 Gbps link bandwidth (vs HDMI 2.0's 18 Gbps) is what makes the higher resolutions and refresh rates possible.
HDMI 2.1 vs HDMI 2.0 specs at a glance
| Spec | HDMI 2.0 | HDMI 2.1 |
|---|---|---|
| Year released | 2013 | 2017 (2.1a: 2022) |
| Max link bandwidth | 18 Gbps | 48 Gbps |
| Max resolution | 4K @ 60Hz | 10K @ 120Hz |
| 4K refresh rate | 60Hz | 120Hz (144Hz with DSC) |
| 1440p refresh rate | up to 144Hz | up to 240Hz |
| Dynamic HDR | No (HDR10 static only) | Yes |
| VRR (Variable Refresh Rate) | No | Yes |
| ALLM (Auto Low Latency Mode) | No | Yes |
| eARC | No (ARC only) | Yes |
| Cable required | High Speed (Cat 2) | Ultra High Speed |
HDMI 2.1 specs (bandwidth, resolutions, refresh rates)
HDMI 2.1 is the current high-end specification published by the HDMI Forum. It triples the link bandwidth of HDMI 2.0 to 48 Gbps and adds a stack of features aimed at gaming and high-resolution video.
- Resolutions: 4K @ 120Hz, 8K @ 60Hz, and up to 10K @ 120Hz with Display Stream Compression (DSC)
- Dynamic HDR — frame-by-frame metadata for color depth and brightness, vs HDMI 2.0's single static profile
- Variable Refresh Rate (VRR) — eliminates screen tearing in games
- Auto Low Latency Mode (ALLM) — switches the display into game mode automatically
- Quick Frame Transport (QFT) and Quick Media Switching (QMS) — reduce latency and eliminate the black-screen pause when refresh rates change
- Enhanced Audio Return Channel (eARC) — supports uncompressed 5.1, 7.1, and object-based audio formats
- Source-Based Tone Mapping (SBTM) — moves HDR tone mapping to the source device
- Ultra High Speed cable required for full 48 Gbps
HDMI 2.0 specs (bandwidth, resolutions, refresh rates)
HDMI 2.0 was published in 2013 and bumped link bandwidth from HDMI 1.4's 10.2 Gbps to 18 Gbps. It is still extremely common on TVs, monitors, and most non-gaming peripherals shipping today.
- Resolutions: up to 4K (3840 × 2160) at 60Hz, with 4:2:0 chroma subsampling for higher color depth modes
- 1440p at up to 144Hz
- 1080p at up to 240Hz
- Up to 32 audio channels, 1536kHz audio sample frequency
- Backward compatible with all earlier High Speed (Category 2) HDMI cables
- Static HDR via HDR10 (no dynamic HDR)
- Audio Return Channel (ARC) — predecessor to eARC
- Wide-angle 21:9 video aspect ratio support
Does HDMI support 1440p?
Yes. HDMI 2.0 supports 1440p (2560 × 1440) at up to 144Hz, and HDMI 2.1 supports 1440p at up to 240Hz. Earlier HDMI 1.4 supports 1440p only at 60Hz. The actual refresh rate you get depends on the source device, the display, and the cable certification.
Do you need an HDMI 2.1 cable?
To use HDMI 2.1 features at full 48 Gbps you need a certified Ultra High Speed HDMI cable — older High Speed (Category 2) cables will work but the link will negotiate down to HDMI 2.0 speeds. Both ends — source and display — must also be HDMI 2.1 compliant; HDMI 2.1 is fully backward compatible with HDMI 2.0 devices, but a 2.1 source connected to a 2.0 display can only operate at HDMI 2.0 specs.
Should you upgrade to HDMI 2.1?
Upgrade if any of these apply: you game on a current-generation console (PS5, Xbox Series X/S) and want 4K @ 120Hz, you have an OLED or high-refresh gaming monitor, you use HDR content seriously, or you want eARC for a soundbar or AVR. If you only watch 4K @ 60Hz video on a TV or use a monitor at 1440p @ 144Hz or below, HDMI 2.0 covers you and an upgrade has no practical benefit yet.
HDMI vs DisplayPort: which to use?
For PC and productivity setups — especially anything driving multiple monitors via daisy-chain — DisplayPort is generally the better choice. DisplayPort 2.1 reaches 80 Gbps versus HDMI 2.1's 48 Gbps, and supports MST daisy-chaining which HDMI does not. For TVs, consoles, and home-theater equipment, HDMI is the dominant standard. See our DisplayPort versions guide for the full comparison.
Frequently asked questions
Can HDMI 2.1 do 144Hz?
Yes. HDMI 2.1 supports 144Hz at 4K (with Display Stream Compression), 240Hz at 1440p, and 240Hz+ at 1080p. HDMI 2.0 also supports 1440p at 144Hz but caps at 60Hz for 4K.
Will HDMI 2.1 work with HDMI 2.0?
Yes. HDMI 2.1 is fully backward compatible with HDMI 2.0 devices. The link will negotiate to the lower of the two specs — so an HDMI 2.1 source connected to an HDMI 2.0 display operates at HDMI 2.0 speeds.
Is HDMI 2.1 good for virtual reality?
Yes. HDMI 2.1's higher bandwidth, low-latency features (QFT, ALLM), and Variable Refresh Rate make it well-suited to current-generation VR headsets and gaming consoles like the PS5.
What is HDMI 2.1a?
HDMI 2.1a is a 2022 update to the HDMI 2.1 spec that adds Source-Based Tone Mapping (SBTM), letting the source device handle HDR tone mapping instead of the display. All other HDMI 2.1 features carry forward unchanged.
Does my Juiced Systems hub support HDMI 2.1?
Most current Juiced Systems USB-C hubs and docking stations output HDMI 2.0 (4K @ 60Hz). Check the individual product page for the rated HDMI version. For 4K @ 120Hz or 8K, you generally need a direct connection from the GPU rather than a hub.
