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Which cable supports 3440×1440 at 144Hz? Bandwidth and HDR guide

24.0 Gbps is the cleanest fit for DP 1.4 at ultrawide 1440p. For the overclock modes above 144 Hz, DSC or HDMI 2.1 becomes the safer path.

A 34-inch ultrawide running native 3440×1440 at 144 Hz with 10-bit 4:4:4 HDR needs 24.0 Gbps. That's 93% of DisplayPort 1.4's 25.9 Gbps, tight but it fits without DSC, which is why the majority of 34-inch 1440p 144 Hz ultrawides ship with DP 1.4 inputs.

By TechCompare · Updated

Required bandwidth
24.0 Gbps
Uncompressed
With DSC
6.4 Gbps
Visually lossless 3:1
Mode
3440×1440 @ 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 Signal24.0 Gbps
Cable Limits Reference
HDMI 2.0
14.4 Gbps
⚠ DSC required
DP 1.4
25.9 Gbps
✓ Native support
HDMI 2.1
42.6 Gbps
✓ Native support
DP 2.1 (UHBR 20)
77.4 Gbps
✓ Native support
Display Mode: 3440 × 1440 @ 144 Hz
Color depth: 10-bit 4:4:4

Calculator

Display Bandwidth Calculator

Required Bandwidth

Uncompressed

23.97 Gbps

With DSC (Display Stream Compression)

6.39 Gbps

Interface Compatibility

HDMI 1.4
DSC Required
HDMI 2.0
DSC Required
HDMI 2.1 (48G)
✓ Native
HDMI 2.2 (96G)
✓ Native
DisplayPort 1.2
DSC Required
DisplayPort 1.4
✓ Native
DisplayPort 2.1 (UHBR 10)
✓ Native
DisplayPort 2.1 (UHBR 13.5)
✓ Native
DisplayPort 2.1 (UHBR 20)
✓ Native
This exact 3440×1440 @ 144 Hz signal, pre-loaded. Swap the resolution, refresh, or chroma, or compare two modes.
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How this is calculated

HDMI 2.1 has vastly more headroom (42.6 Gbps) and most modern monitors support both. Push past 144 Hz. The 175 Hz and 180 Hz overclock modes common on ultrawides put you above DP 1.4's ceiling (roughly 30 Gbps at 180 Hz), which forces DSC. DP 1.2 tops out at 17.28 Gbps and can't carry this mode at all without dropping bit depth or chroma.

Verdict

3440x1440 at 144 Hz with 10-bit 4:4:4 HDR needs 24.0 Gbps, 93% of DisplayPort 1.4's effective 25.9 Gbps ceiling, which is tight but fits natively without DSC and keeps latency at the uncompressed best-case value. That's why the majority of 34-inch 1440p 144 Hz ultrawides ship with DP 1.4 inputs as the default link. Push past 144 Hz to the 175 Hz and 180 Hz overclock modes common on ultrawides and the bandwidth crosses 30 Gbps, exceeding DP 1.4's ceiling and forcing DSC or an HDMI 2.1 hop. DP 1.2 (17.28 Gbps) can't carry the mode uncompressed at any refresh without dropping bit depth or chroma, so the pick lands on DP 1.4 at 144 Hz as the default with DSC or HDMI 2.1 as the overclock path.

More Ultrawide 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 - 4K 144 Hz HDR
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.
View details ➜

Related guides

34" 21:9 ultrawide screen size
The 34-inch ultrawide screen size this 24 Gbps mode is built for.
View guide ➜
1800R 34" ultrawide curve
The gentle curve most 34-inch 144 Hz ultrawides ship with.
View guide ➜

Frequently asked questions

Which cable is best for a 3440×1440 144Hz ultrawide monitor?
DisplayPort 1.4 is highly recommended, as it carries the 24 Gbps required bandwidth uncompressed for full 10-bit HDR.
Can HDMI 2.0 handle 1440p 144 Hz on a 21:9 ultrawide?
Only at 8-bit. The mode needs 17.8 Gbps at 10-bit 4:4:4 HDR, which exceeds HDMI 2.0's 14.4 Gbps ceiling. HDMI 2.1 carries it natively for consoles and living-room GPUs. On the PC side, DisplayPort 1.4 handles the same mode uncompressed with headroom to spare, so cable choice maps to which device sits at the far end.
Does AMD FreeSync or NVIDIA G-Sync work at 1440p 144 Hz on 21:9 ultrawides?
Yes, both adaptive-sync technologies work on certified 1440p 144 Hz ultrawide panels. DisplayPort 1.4 carries the VRR metadata natively. HDMI 2.1 VRR also works but is less common on ultrawides. Make sure your GPU and monitor both support the same VRR brand.

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