Does HDMI 2.1 support 4K 144Hz? Bandwidth and compression limits

4K 144 Hz with 10-bit 4:4:4 HDR needs 40.1 Gbps, within 6% of HDMI 2.1's effective 42.6 Gbps ceiling. It's the highest uncompressed 4K refresh rate HDMI 2.1 can reach at full color fidelity, and the reason 144 Hz 4K monitors with HDMI 2.1 inputs exist.

Required bandwidth

40.1 Gbps

Uncompressed

With DSC

10.7 Gbps

Visually lossless 3:1

Mode

3840×2160 @ 144 Hz

10-bit 4:4:4

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 Signal40.1 Gbps

With Display Stream Compression (DSC)10.7 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

⚠ DSC required

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: 3840 × 2160 @ 144 Hz

Color depth: 10-bit 4:4:4

Resolution

Refresh Rate: 144 Hz

Color Depth

Chroma

Required Bandwidth

Uncompressed

40.13 Gbps

With DSC (Display Stream Compression)

10.70 Gbps

Interface Compatibility

HDMI 1.4

✗ Incompatible

HDMI 2.0

DSC Required

HDMI 2.1 (48G)

✓ Native

HDMI 2.2 (96G)

✓ Native

DisplayPort 1.2

DSC Required

DisplayPort 1.4

DSC Required

DisplayPort 2.1 (UHBR 10)

DSC Required

DisplayPort 2.1 (UHBR 13.5)

✓ Native

DisplayPort 2.1 (UHBR 20)

✓ Native

How this is calculated

Push to 160 Hz or higher at the same color depth and you run out of uncompressed headroom. Display Stream Compression (DSC 3:1) then kicks in, compressing the signal to about 10.7 Gbps visually losslessly. Most 4K 240 Hz monitors rely on DSC for exactly this reason. At 144 Hz you can still avoid it on HDMI 2.1.

Verdict

40.1 Gbps is the practical ceiling for uncompressed 4K gaming over HDMI 2.1. If you're at 4K 144 Hz today, this is your mode; anything faster and DSC stops being optional.