HDMI versions
Also known as: HDMI 2.0, HDMI 2.1, HDMI cable, ARC, eARC
HDMI (High-Definition Multimedia Interface) is the cable that connects your TV to a streaming device, your monitor to a PC, or a projector to a laptop.
Different HDMI versions support different maximum resolutions and refresh rates: the cable version matters when setting up 4K or high-refresh-rate displays.
HDMI versions, explained at three levels
At home
HDMI is the cable that connects your TV or monitor to a video source. Modern TVs, gaming consoles, streaming sticks, and computers all use HDMI. The version number matters if you want 4K video or a high frame rate: older cables can't carry that much data.
At work
HDMI is the standard cable for sending digital video and audio from laptops, PCs, and media players to displays and projectors. Each version raises the maximum bandwidth, which sets the highest resolution and refresh rate a link can carry. Businesses care because a conference room only performs as well as its weakest link: one old cable, switch, or port quietly drops a 4K signal to lower quality.
At home
HDMI 2.0 supports 4K at 60Hz: enough for most TVs and monitors. HDMI 2.1 adds 4K at 120Hz (for gaming and high-frame-rate content), 8K at 60Hz, Variable Refresh Rate (VRR, reduces gaming screen tear), Auto Low Latency Mode (ALLM), and eARC (Enhanced Audio Return Channel for Dolby Atmos passthrough).
At work
Every HDMI link is negotiated end to end. The source reads the display's EDID, a small data block listing supported resolutions and refresh rates, then picks the best mode the whole chain can carry, while HDCP checks that each device is licensed for protected content. Switches, splitters, and extenders sit in that chain too, so one older device caps everything. Passive cables reliably reach about 5 metres; longer runs use active, fibre, or HDBaseT extenders.
At home
HDMI up to version 2.0 sends video over TMDS (Transition-Minimized Differential Signaling): three data lanes plus a clock lane, topping out at 18 Gbps. HDMI 2.1 replaced this with FRL (Fixed Rate Link), which turns the clock lane into a fourth data lane, runs each lane faster, and uses more efficient 16b/18b encoding, reaching 48 Gbps. Display Stream Compression stretches that further. In my view, cable certification labels matter more than version numbers on the box.
At work
HDCP (High-bandwidth Digital Content Protection) is embedded in HDMI and enforced by content providers: streaming 4K content requires HDCP 2.2 or 2.3 support throughout the chain. eARC over HDMI 2.1 allows uncompressed 7.1 audio and Dolby Atmos object-based audio to pass from a TV back to a receiver, replacing optical audio cables that couldn't carry lossless formats.
Real-world examples
At home
Marcus bought a 4K/144Hz gaming monitor but his GPU's HDMI port was version 2.0: it could only drive the monitor at 4K/60Hz. He switched to DisplayPort 1.4 and got the full refresh rate he paid for.
At work
Fatima's team specified HDMI 2.1 ports and Ultra High Speed cables throughout a new conference room installation. Today's displays run 4K at 60Hz, and the extra bandwidth leaves room for 4K at 120Hz or 8K screens later without rewiring.
How it compares
| feature | HDMI 1.4 | HDMI 2.0 | HDMI 2.1 |
|---|---|---|---|
| Max bandwidth | 10.2 Gbps | 18 Gbps | 48 Gbps |
| 4K @ 60Hz | No (30Hz only) | Yes | Yes |
| 4K @ 120Hz | No | No | Yes |
| 8K support | No | No | Yes (60Hz) |
| VRR (gaming) | No | No | Yes |
| eARC | No (ARC only) | No (ARC only) | Yes |
For analysts
HDMI version knowledge is useful when procuring AV equipment for conference rooms or presentation setups: specifying the wrong cable version is a common cause of video quality issues that require expensive on-site fixes.
History & origin
HDMI 1.0 launched in 2002, created by a consortium of consumer electronics companies (Sony, Panasonic, Philips, Thomson, Toshiba, Hitachi, and Silicon Image) to replace the tangle of separate audio and video cables. It combined video and audio in one cable and added HDCP copy protection. Major versions since: 1.4 (2009, added 4K/30Hz and ARC), 2.0 (2013, 4K/60Hz), 2.1 (2017, 8K/60Hz, 4K/120Hz, eARC, and VRR for gaming), and 2.2 (2025, up to 96 Gbps with new Ultra96 cables).