Can HDMI 2.1 run 8K at 60Hz? Chroma subsampling and bandwidth requirements

8K at 60 Hz with 10-bit 4:2:0 chroma works out to 33.4 Gbps, the uncompressed figure HDMI 2.1 was carefully engineered to support. Jumping from 4:2:0 to full 4:4:4 chroma doubles the required bandwidth, which is why 8K marketing specs quote 4:2:0 unless DSC is on.

Required bandwidth

33.4 Gbps

Uncompressed

With DSC

17.8 Gbps

Visually lossless 3:1

Mode

7680×4320 @ 60 Hz

10-bit 4:2:0

Interface Bandwidth Analysis

See how much uncompressed and compressed bandwidth this resolution and refresh rate mode demands, compared to the native limits of common video cables.

Uncompressed Signal33.4 Gbps

With Display Stream Compression (DSC)17.8 Gbps

DSC uses visually lossless 3-to-1 compression, shrinking the required bandwidth so it fits through older cables.

Cable Limits Reference

HDMI 2.0

14.4 Gbps

✗ Not supported

DP 1.4

25.9 Gbps

⚠ DSC required

HDMI 2.1

42.6 Gbps

✓ Native support

DP 2.1 (UHBR 20)

77.4 Gbps

✓ Native support

Display Mode: 7680 × 4320 @ 60 Hz

Color depth: 10-bit 4:2:0

Resolution

Refresh Rate: 60 Hz

Color Depth

Chroma

Required Bandwidth

Uncompressed

33.44 Gbps

With DSC (Display Stream Compression)

17.84 Gbps

Interface Compatibility

HDMI 1.4

✗ Incompatible

HDMI 2.0

✗ Incompatible

HDMI 2.1 (48G)

✓ Native

HDMI 2.2 (96G)

✓ Native

DisplayPort 1.2

✗ Incompatible

DisplayPort 1.4

DSC Required

DisplayPort 2.1 (UHBR 10)

✓ Native

DisplayPort 2.1 (UHBR 13.5)

✓ Native

DisplayPort 2.1 (UHBR 20)

✓ Native

How this is calculated

4:2:0 chroma subsampling halves the color-difference resolution, which is invisible for video content (movies, streaming) but slightly degrades fine-text edges on a desktop. That's an acceptable trade at 8K because the pixel density is already so extreme that the subsampling effect is below the threshold of perception at normal viewing distances. DSC is the alternative path, and it lets HDMI 2.1 carry 8K at 60 Hz with 10-bit 4:4:4 compressed to roughly 8.9 Gbps.

Verdict

8K 60 Hz is the spec HDMI 2.1 was designed for and the one most 8K TVs negotiate at. With DSC in play, there's headroom to go further. Without it, 4:2:0 is the choice for video playback.