AMD RDNA3 GPUs might support UHBR20, allowing DisplayPort bandwidth up to 80 Gbps

Tudor Cibean

Posts: 97   +6
Staff
What just happened? A recent AMD display engine drivers patch added support for Displayport 2.0's Ultra High Bit Rate (UHBR) transmission modes. The feature will allow a maximum bandwidth of 80 Gbit/s, which, coupled with DSC, should be enough for most displays launched in the next few years.

Even though we are still a few months away from the launch of AMD's next-gen GPUs, the company is hard at work developing the software that will make those cards work properly.

A recent patch confirms that GPUs based on the RDNA3 architecture will support DisplayPort 2.0 and might be capable of the highest UHBR20 transmission mode. If used with a capable cable and monitor, that would allow for a maximum bandwidth of 80 Gbit/s.

In March, the Video Electronics Standards Association (VESA) started its DP 2.0 certification program. There are already a couple of cables that are UHBR20 certified, although they're limited to 0.8m. As DP 2.0 leverages the Thunderbolt 3 physical interface layer, passive cables share the same length limitations when using the highest transfer speeds. This problem can be solved with more expensive active cabling.

If AMD's upcoming GPUs support UHBR20, they should be able to output HDR video with a resolution of 4K at 240 Hz or 8K at 60Hz without even using DSC. With DSC, which VESA claims is visually lossless and can compress a data stream by a 3:1 ratio, you could drive an 8K 144Hz HDR screen through a single cable.

Of course, there's also the issue of not having any DP 2.0-capable monitors. These got delayed several times, but they're hopefully going to launch soon, considering we almost have host devices supporting the standard on the market.

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kiwigraeme

Posts: 1,051   +777
Probably more useful than a 200 megapixel camera .
If it's "free" then why not .

Though the 4K HDR 240Htz is viable for FPS who want it all
 

NeoMorpheus

Posts: 1,147   +2,313
AMD this week….

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VitalyT

Posts: 6,236   +6,769
they should be able to output HDR video with a resolution of 4K at 240 Hz or 8K at 60Hz without even using DSC
So, it can only output 8K at the same 60Hz as HDMI 2.1, but 4K at twice the speed of HDMI 2.1? This is kind of odd.
 

psycros

Posts: 4,160   +5,805
So, it can only output 8K at the same 60Hz as HDMI 2.1, but 4K at twice the speed of HDMI 2.1? This is kind of odd.

Displayport can handle higher refresh rates. That's why your GPU has way more DP ports than HDMI. What I don't get is why 4K TV's don't have DP inputs.
 

Thanthan

Posts: 77   +163
Probably more useful than a 200 megapixel camera .
If it's "free" then why not .

Though the 4K HDR 240Htz is viable for FPS who want it all

Yea, especially considering that that 200 megapixel cameras main feature is that it can combine it’s pixels 4:1 for a 50 megapixel camera… which means it’ll be functionally slightly worse than if they had just made a 50 megapixel sensor, since that could have had slightly more than four times as large pixels xD and smartphone lenses don’t have a hope in hell of resolving to 50 megapixel anyhow… megapixel wars truly are stupendously dumb.