The HDMI 2.1 specification has been officially released

Variable refresh rates, 8K 60FPS support and more

The HDMI 2.1 specification has been officially released

The HDMI 2.1 specification has been officially released

HDMI Forum Incorporated has unleashed their official HDMI 2.1 specifications, revealing some colossal upgrades to the HDMI standard that will not only deliver high resolutions with less compression but new features like dynamic refresh rates and support for dynamic HDR. 

For gamers, the key upgrades here is support for 4K 120Hz with 4:4:4 sampling and up to 12-bit colour, which is an amazing feat when compared to HDMI 2.0. HDMI 2.0 offered 18Gbps of bandwidth while HDMI 2.1 offers 48Gbps of bandwidth, offering an over 2x improvement to deliver increased image quality and even lower latency operation. 
HDMI 2.1 will be backwards compatible with all existing HDMI standards, though it utilises the full bandwidth and features offered by HDMI 2.1, users will need to use a new HDMI 2.1 ultra high speed HDMI cable. 

The HDMI 2.1 specification has been officially released

One of the biggest changes to HDMI 2.1 is the ability to utilise higher resolutions without compressions, with the standard supporting 8K 60Hz with ease with full 4:4:4 sampling. HDMI 2.1 has also been designed to offer an Auto Low Latency Mode (ALLM) to provide users with the smoothest, lag-free experience. 

The HDMI 2.1 specification has been officially released  


For gamers, one of the biggest upgrades here will be the addition of Variable refresh rates (VRR), which is designed to reduce or eliminate lag while also preventing stutter or tearing while playing games, offering the same features as AMD FreeSync. At this time it is unknown how similar this technology is to AMD FreeSync over HDMI. 

The HDMI 2.1 specification has been officially released


The HDMI 2.1 compliance test specification is set to be published in stages during Q1-Q3 2018, which means that we are unlikely to see any devices with support for HDMI 2.1 in the near future. 

This new standard is also likely to make waves within the PC industry, as HDMI's new standard will likely be adopted by both Nvidia and AMD, forcing Nvidia to support a variable refresh technology outside of their proprietary G-Sync solution. This change should also help to make variable refresh rate displays more widely available in the future. 

More information on HDMI 2.1 is available to read on HDMI Forum's press release here. HDMI official presentation slide deck is also available to view here

You can join the discussion on HDMI 2.1 on the OC3D Forums

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Most Recent Comments

28-11-2017, 13:50:26

Finally caught up to displayportQuote

28-11-2017, 14:16:22

Anyone know why it's being called 2.1 and not 3.0?Quote

28-11-2017, 14:19:03

It's hard to count?Quote

28-11-2017, 14:33:02

Originally Posted by AngryGoldfish View Post
Anyone know why it's being called 2.1 and not 3.0?
The same thing can be said for USB 3.1. For some reason, a 2x increase is not enough for a big change in the number.

Then again USB 3.0 did offer more than a 10x increase over 2.0Quote

29-11-2017, 06:18:33

Thank god!

The starting gun on the death of G-Sync has been fired with this.

Nvidia will have to come up with a new, rip off cash cow exclusive for their cards.Quote

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