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

23.5 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 23.5 Gbps. That's 91% 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
23.5 Gbps
Uncompressed
With DSC
6.3 Gbps
Visually lossless 3:1
Mode
3440×1440 @ 144 Hz
10-bit 4:4:4, CVT-RB v2

Interface Bandwidth Analysis

See how much uncompressed and compressed bandwidth this resolution and refresh rate mode demands, compared to HDMI and DisplayPort connections.

Uncompressed Signal23.5 Gbps
Display Connection Reference
HDMI 2.0
14.4 Gbps
✗ Not supported
HDMI 2.1 48G
42.6 Gbps
✓ Native support
HDMI 2.2 96G
85.3 Gbps
✓ Native support
DP 1.4
25.9 Gbps
✓ Native support
DP 2.1b UHBR 20
77.4 Gbps
✓ Native support
Other connections

Assumes display traffic only and four DisplayPort lanes for USB-C. USB4 and Thunderbolt figures are for one DisplayPort stream.

USB-C DP 1.4
25.9 Gbps
✓ Native support
Thunderbolt 5
77.4 Gbps
✓ Native support
USB4 v2 80G / 120G
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

23.46 Gbps

With DSC (Display Stream Compression)

6.26 Gbps

Interface Compatibility

HDMI
HDMI 1.4✗ Incompatible
HDMI 2.0✗ Incompatible
HDMI 2.1 (48G)✓ Native
HDMI 2.2 (96G)✓ Native
DisplayPort
DisplayPort 1.2✗ Incompatible
DisplayPort 1.4✓ Native
DisplayPort 2.1b (UHBR 10)✓ Native
DisplayPort 2.1b (UHBR 13.5)✓ Native
DisplayPort 2.1b (UHBR 20)✓ Native
Other connections

Assumes one display with no USB or PCIe data sharing. USB-C uses all four DisplayPort lanes. USB4 and Thunderbolt use the DisplayPort profile listed. The 120 Gbps modes add bandwidth for multiple streams, while one DP 2.1 UHBR 20 stream stays at 77.37 Gbps. Compare checks each display separately.

USB-C
USB-C (DP 1.2)✗ Incompatible
USB-C (DP 1.4)✓ Native
USB-C (DP 2.1b UHBR 10)✓ Native
USB-C (DP 2.1b UHBR 13.5)✓ Native
USB-C (DP 2.1b UHBR 20)✓ Native
Thunderbolt
Thunderbolt 3 (40G, DP 1.2)✗ Incompatible
Thunderbolt 3 (40G, DP 1.4)✓ Native
Thunderbolt 4 (40G, DP 1.4)✓ Native
Thunderbolt 5 (80G / 120G Boost)✓ Native
USB4
USB4 20G (DP 1.4, HBR2)DSC Required
USB4 40G (DP 1.4)✓ Native
USB4 v2 (80G / 120G, DP 2.1)✓ Native
This exact 3440×1440 @ 144 Hz signal, pre-loaded. Swap the resolution, refresh, or chroma, or compare two modes.
Edit in the full tool

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 23.5 Gbps, 91% 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 climbs to about 29-30 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 14.3 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 35.6 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 39.2 Gbps, within 8% of the calculator's effective 42.6 Gbps HDMI 2.1 model.
View details ➜

Related guides

34" 21:9 ultrawide screen size
The 34-inch ultrawide screen size this 23.5 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 23.5 Gbps required bandwidth uncompressed for full 10-bit HDR.
Can HDMI 2.0 handle 1440p 144 Hz on a 21:9 ultrawide?
No for this modeled 3440x1440 timing. It needs about 23.46 Gbps at 10-bit 4:4:4 and 18.77 Gbps at 8-bit, both above HDMI 2.0's 14.4 Gbps payload ceiling. Lower the refresh rate or chroma resolution, or use a faster interface. 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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