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

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.

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.

By TechCompare · Updated

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

Calculator

Display Bandwidth Calculator

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
This exact 3840×2160 @ 144 Hz signal, pre-loaded. Swap the resolution, refresh, or chroma, or compare two modes.
Edit in the full tool

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 13.4 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 sits within 6% of HDMI 2.1's effective 42.6 Gbps ceiling, which makes 4K 144 Hz the highest uncompressed 4K refresh that interface can reach at full 10-bit 4:4:4 HDR fidelity. Push to 160 Hz or higher at the same color depth and the spec runs out of headroom and DSC 3:1 kicks in, compressing the signal to roughly 13.4 Gbps visually losslessly, which is the path most 4K 240 Hz monitors take. At 144 Hz the user stays on the uncompressed side and avoids the sub-millisecond DSC latency, which is why this is the practical ceiling for competitive 4K gaming over HDMI 2.1.

More HDMI 2.1 scenarios

HDMI 2.1 - 4K 60 Hz
4K at 60 Hz with 8-bit 4:4:4 color needs 13.4 Gbps of uncompressed bandwidth.
View details ➜
HDMI 2.1 - 4K 120 Hz HDR
4K 120 Hz with 10-bit 4:4:4 color HDR needs 33.4 Gbps, the benchmark mode HDMI 2.1 was designed to support without compression.
View details ➜
HDMI 2.1 - 8K 60 Hz (4:2:0)
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.
View details ➜

Related guides

27" 16:9 monitor screen size
The desktop 4K 144 Hz panel size that benefits from this cable.
View guide ➜
27" 4K monitor PPI
PPI of the 27-inch 4K 144 Hz HDMI 2.1 panel.
View guide ➜

Frequently asked questions

Is DSC compression required for 4K 144Hz over HDMI 2.1?
No, 4K at 144Hz with 10-bit HDR requires 40.1 Gbps, which fits within the 42.6 Gbps effective limit of a full-speed HDMI 2.1 port.
What GPU do I need to drive 4K 144 Hz over HDMI 2.1?
An RTX 30-series or newer, RX 6000-series or newer, or Arc A-series GPU. Any current-gen card should have HDMI 2.1 outputs. The GPU must sustain roughly 144 fps at 4K in your target game, which usually means an RTX 4080 or better at native resolution in demanding AAA titles. DLSS or FSR upscaling helps a lot here.
Does 4K 144 Hz over HDMI 2.1 need an active cable?
No for runs under 3 meters. A certified Ultra High Speed passive HDMI 2.1 cable handles 4K 144 Hz at full 48 Gbps up to about 3 meters. For longer runs use an active optical HDMI cable rated for 48 Gbps. Standard passive cables fail past 3 meters at this bandwidth.

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