A complete spec comparison of HDMI 2.0 and HDMI 2.1. See exactly how bandwidth, resolution, refresh rate, HDR, gaming features, and audio differ between the two versions, and which one you actually need for your TV, receiver, console, and cables.
The core difference is bandwidth. HDMI 2.0 carries up to 18 Gbps total (about 14.4 Gbps of effective data), while HDMI 2.1 carries up to 48 Gbps total (about 42.6 Gbps effective). That roughly 2.7x jump in usable bandwidth is what lets HDMI 2.1 do 4K at 120Hz, 8K at 60Hz, and resolutions up to 10K, where HDMI 2.0 tops out at 4K at 60Hz. HDMI 2.1 also adds a set of features that 2.0 simply does not have: variable refresh rate (VRR), auto low latency mode (ALLM), Quick Frame Transport and Quick Media Switching (QFT/QMS), dynamic HDR, and eARC for passing lossless Dolby Atmos and DTS:X audio.
In practice, you need HDMI 2.1 for 4K 120Hz console and PC gaming, 8K video, or sending lossless immersive audio from your TV apps to a receiver via eARC. For ordinary 4K 60Hz movie watching with HDR10 or Dolby Vision, HDMI 2.0 is enough. Both versions use the same backward-compatible Type-A connector, but to unlock full HDMI 2.1 features you need a certified Ultra High Speed HDMI cable rated for 48 Gbps. The table below breaks down every spec difference.
This table compares HDMI 2.0 (including the 2.0a and 2.0b revisions) against HDMI 2.1 (with a note where 2.1a adds Source-Based Tone Mapping) across the specifications that matter for a home theater or gaming setup. Specs are per the HDMI Licensing Administrator and HDMI Forum specifications.
| Specification | HDMI 2.0 (2.0 / 2.0a / 2.0b) | HDMI 2.1 (2.1a adds SBTM) |
|---|---|---|
| Max Total Bandwidth | 18 Gbps | 48 Gbps |
| Max Effective Data Rate | 14.4 Gbps | 42.6 Gbps |
| 4K Max Refresh | 4K @ 60Hz | 4K @ 120Hz (up to 144Hz) |
| 8K Support | No | Yes, 8K @ 60Hz (10K with DSC) |
| Max Resolution | 4K @ 60Hz | Up to 10K |
| HDR | HDR10 / static (2.0a added HDR) | Dynamic HDR; 2.1a adds SBTM |
| VRR (Variable Refresh Rate) | No | Yes |
| ALLM (Auto Low Latency Mode) | No | Yes |
| QFT / QMS | No | Yes (Quick Frame Transport / Quick Media Switching) |
| eARC | No (ARC only) | Yes, eARC (Atmos/DTS:X lossless, up to 37 Mbps) |
| Color / Chroma Example | 4K60 4:4:4 8-bit max (4:2:0 for higher) | 4K120 4:4:4 10-bit, etc. |
| Cable Required | High Speed HDMI (18 Gbps) | Ultra High Speed HDMI (48 Gbps, certified) |
| Connector | Type-A (backward compatible) | Same Type-A (backward compatible) |
DSC = Display Stream Compression. SBTM = Source-Based Tone Mapping. Specs per the HDMI Licensing Administrator / HDMI Forum specification.
HDMI 2.1 is not just a bigger pipe. Alongside the jump from 18 Gbps to 48 Gbps, it introduces several distinct features that HDMI 2.0 lacks entirely. Here are the additions that matter most for movies, gaming, and audio.
The foundational change is raw bandwidth. HDMI 2.0 tops out at 18 Gbps total, roughly 14.4 Gbps of usable data after protocol overhead. HDMI 2.1 raises that ceiling to 48 Gbps total, about 42.6 Gbps of effective data, a roughly 2.7x increase.
That headroom is what enables everything else: higher resolutions up to 10K, 4K at 120Hz, 8K at 60Hz, and richer color at higher refresh rates. Where HDMI 2.0 must drop to 4:2:0 chroma subsampling to fit higher formats, HDMI 2.1 has the bandwidth to carry fuller color, such as 4K120 at 4:4:4 10-bit.
HDMI 2.0 caps out at 4K at 60Hz. HDMI 2.1 pushes 4K to 120Hz (and up to 144Hz), supports 8K at 60Hz, and goes all the way up to 10K with Display Stream Compression (DSC), a visually lossless compression technique.
For movie watching at 24 or 60 frames per second, 4K 60Hz is plenty, so HDMI 2.0 suffices. But for high-frame-rate console and PC gaming, 4K 120Hz is a meaningful upgrade that only HDMI 2.1 can deliver. If you own a PS5 or Xbox Series X and want their 120Hz modes, you need HDMI 2.1 end to end.
HDMI 2.1 adds a suite of gaming features absent from 2.0. Variable Refresh Rate (VRR) syncs the display's refresh to the GPU's frame output, eliminating screen tearing and stutter. Auto Low Latency Mode (ALLM) automatically switches the TV into its low-latency game mode when a console starts a game, and back when you stop.
Quick Frame Transport (QFT) reduces display latency by sending each frame faster, and Quick Media Switching (QMS) eliminates the brief black screen when content changes frame rate. None of these exist in HDMI 2.0, which is why serious gaming setups prioritize HDMI 2.1 ports.
HDMI 2.0 supports ARC (Audio Return Channel), which sends audio from a TV back to a receiver or soundbar, but only compressed formats. HDMI 2.1 introduces eARC (enhanced Audio Return Channel), which carries full-bandwidth lossless audio at up to 37 Mbps.
That extra bandwidth is exactly what lossless immersive audio needs: eARC can pass Dolby Atmos riding on Dolby TrueHD and DTS:X riding on DTS-HD Master Audio from your TV's built-in apps back to your receiver over a single cable. If you stream Atmos content through your TV and want it to reach your speakers losslessly, both your TV and receiver need eARC. See the difference between immersive formats in our audio formats comparison.
HDMI 2.1 is the better spec, but you do not always need it. Whether 2.0 is sufficient depends entirely on what you connect and what you watch or play. Here is how to decide based on your setup.
For a movie-first home theater, HDMI 2.0 covers most needs. It handles 4K at 60Hz with HDR10 and Dolby Vision, which is the format virtually all 4K streaming and 4K Blu-ray content uses. If your sources are a 4K streaming device, a 4K Blu-ray player, and a TV you watch films on, HDMI 2.0 ports and High Speed HDMI cables will not bottleneck you.
You can still get excellent HDR with HDMI 2.0, since 4K 60Hz HDR10 fits comfortably within its 18 Gbps. The limits only appear when you push past 4K 60Hz or need the gaming and lossless-audio features that 2.1 adds.
Choose HDMI 2.1 if any of these apply: you game at 4K 120Hz on a PS5, Xbox Series X, or modern PC; you want VRR and ALLM for tear-free, low-latency gaming; you plan to use 8K video; or you want eARC to pass lossless Dolby Atmos and DTS:X from your TV apps to a receiver or soundbar.
Even if you do not need it today, HDMI 2.1 future-proofs a new purchase at little extra cost. When buying a new TV or AV receiver, confirm the HDMI 2.1 features you care about are supported on the specific ports you will use, since some products implement only a subset. Our HDR formats guide covers the bandwidth each HDR format needs.
The headline difference is bandwidth: HDMI 2.0 carries up to 18 Gbps total (about 14.4 Gbps of effective data), while HDMI 2.1 carries up to 48 Gbps total (about 42.6 Gbps effective). That extra bandwidth lets HDMI 2.1 do 4K at 120Hz, 8K at 60Hz, and up to 10K, where HDMI 2.0 tops out at 4K at 60Hz.
HDMI 2.1 also adds gaming and convenience features that 2.0 lacks, including VRR, ALLM, QFT/QMS, and eARC for lossless audio passthrough.
You need HDMI 2.1 if you want 4K at 120Hz (common for PS5 and Xbox Series X gaming), 8K video, variable refresh rate (VRR), auto low latency mode (ALLM), or eARC to pass lossless Dolby Atmos and DTS:X audio from a TV to a receiver or soundbar.
For ordinary 4K 60Hz movie watching and HDR10 or Dolby Vision streaming, HDMI 2.0 is sufficient. If you are buying new gear or cables today, HDMI 2.1 future-proofs your setup.
HDMI 2.0 has a maximum total bandwidth of 18 Gbps, of which about 14.4 Gbps is usable data after overhead. HDMI 2.1 raises the maximum total bandwidth to 48 Gbps, with about 42.6 Gbps of effective data rate.
This roughly 2.7x increase in usable bandwidth is what enables the higher resolutions, refresh rates, and color depths of HDMI 2.1.
No. HDMI 2.0 maxes out at 4K at 60Hz with full chroma. You need HDMI 2.1 for 4K at 120Hz (and even 4K at 144Hz).
The 18 Gbps ceiling of HDMI 2.0 simply does not have the bandwidth to carry a 4K 120Hz signal at usable color depth, which is why 4K 120Hz gaming on a PS5 or Xbox Series X requires HDMI 2.1 ports and an Ultra High Speed HDMI cable.
eARC (enhanced Audio Return Channel) lets a TV send full-bandwidth, lossless audio such as Dolby Atmos over Dolby TrueHD and DTS:X over DTS-HD Master Audio back to an AV receiver or soundbar over a single HDMI cable, at up to 37 Mbps. eARC is an HDMI 2.1 feature.
HDMI 2.0 only supports the older ARC, which is limited to compressed audio and cannot carry lossless immersive formats. To pass lossless Atmos from your TV apps to a receiver, you need eARC on both the TV and the receiver.
Yes, for full HDMI 2.1 features you need a certified Ultra High Speed HDMI cable rated for 48 Gbps. A standard High Speed HDMI cable (rated for 18 Gbps) is fine for HDMI 2.0 signals like 4K 60Hz, but it cannot reliably carry 4K 120Hz or 8K.
The connector itself is the same Type-A plug and is backward compatible, so an Ultra High Speed cable also works for older devices, but a High Speed cable will bottleneck a 2.1 source. See our best HDMI cables guide for certified picks.
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Certified Ultra High Speed HDMI 2.1 cable rated for the full 48 Gbps. Required for 4K@120Hz gaming, 8K video, and lossless eARC audio passthrough. Braided construction for durability.
Full HDMI 2.1 inputs and outputs with 8K passthrough, 4K@120Hz, VRR, ALLM, and eARC for lossless Dolby Atmos and DTS:X. A future-proof hub for a modern home theater and gaming setup.
Keep optimizing your signal chain with these related guides on cables, HDR, and audio.
Certified Ultra High Speed HDMI cables that guarantee full 48 Gbps bandwidth for 4K 120Hz, 8K, and eARC.
Dolby Vision vs HDR10 vs HDR10+ vs HLG, including the HDMI bandwidth each HDR format requires.
Dolby Atmos vs DTS:X vs Auro-3D, including the lossless audio that eARC on HDMI 2.1 can carry.
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