Amd limits hdr to 8 bits on hdmi 2.0 interface

HDR stands for High Dynamic Range technology, one of the biggest claims in the TV industry today and which is normally associated with more advanced models with 4K panel resolution. Despite the fact that current PC monitors do not offer HDR support (neither of them), current AMD Polaris and Nvidia Pascal graphics cards do support this technology.

AMD has limited HDR technology in its HDMI 2.0

To add fun to the matter, AMD graphics cards do not have support for 10-bit color depth on the HDMI 2.0 interface when using 4K resolution, this means that these cards are limited to offering 8 bits per pixel (BPP), whereby the quality of the image is impaired by sub-sampling of the lower quality video signal, in most cases it reaches values ​​of 4: 2: 2 or 4: 2: 0 instead of 4: 4: 4 which is optimal.

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This information has been known through tests of the Heise.de medium that Shadow Warrior 2, one of the few games with HDR support, has been testing.The boys of this German medium have had to make use of the DisplayPort interface of their AMD Radeon RX 480 to be able to use HDR technology in all its splendor since HDMI is limited by what was discussed in the previous paragraph. HDR technology enables superior image quality to be achieved by achieving much more vivid and intense colors, while also enhancing the contrast between light and dark areas.

Source: techpowerup