How to Fix Color Banding in Windows 11 on an Ultrawide Monitor

Windows 11 ultrawide monitor banding is usually a settings mismatch, not a reason to panic. Fix color banding by checking HDR, colour depth, GPU range, refresh rate, and the correct native resolution.

Build Lab · 10 Sept 2026 · 2 min read · MonitorMuse ·

Plenty of SA buyers overthink this, so here is the short, useful version you can act on. We answer "How to Fix Color Banding in Windows 11 on an Ultrawide Monitor" directly, with numbers that matter in SA.

Quick Answer

On a build with an ultrawide monitor, banding most often comes from a limited colour range or 6-bit output, not damaged hardware. Switch to full RGB, enable 10-bit colour, and reseat the cable. These steps fix banding for the large majority of Windows 11 users at no cost.

Update Drivers and Firmware

Install the latest GPU driver and check the monitor for a firmware update. Outdated drivers often default to limited colour, which causes banding. After updating, restart and recheck a 1440p gradient test image on your 240Hz panel.

Set Colour Depth and Range Correctly

Open the GPU control panel and set output to 10-bit, or 8-bit with dithering if 10-bit is unavailable. Switch dynamic range to Full RGB so dark gradients render smoothly at 1440p. On Windows 11 with an ultrawide monitor, this single change removes most banding immediately.

Check the Cable and Bandwidth

A cheap or damaged cable can starve 240Hz output at 1440p and force colour compression. Use a certified DisplayPort or HDMI cable rated for your resolution and refresh rate, often around R4,200. With an ultrawide monitor, plug directly into the graphics card output for full bandwidth.

FAQ

Can a cable cause colour banding?

Yes. A cable that cannot carry full bandwidth for 240Hz at 1440p can force colour compression. Use a certified DisplayPort or HDMI cable, often around R4,200, plugged into the graphics card.

Is colour banding a sign of a faulty monitor?

Rarely. It is almost always a software or cable issue at 1440p, fixable for the cost of a R14,900 cable at most. Only if it persists after correct 10-bit colour settings and a good cable should you consider a panel fault.

Does HDR cause banding?

Poorly calibrated HDR can. Calibrate HDR in Windows 11 and lower extreme contrast at 240Hz and 1440p; if banding shows only in HDR, the fix is in the HDR settings, not the hardware.

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