Which cable supports 3440×1440 at 144Hz? Bandwidth and HDR guide
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.
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.
Calculator
Display Bandwidth Calculator
Required Bandwidth
Uncompressed
23.97 Gbps
With DSC (Display Stream Compression)
6.39 Gbps
Interface Compatibility
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
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.
More Ultrawide scenarios
Frequently asked questions
Which cable is best for a 3440×1440 144Hz ultrawide monitor?
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