Dell U4021QW Review

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The Dell U4021QW is great for productivity thanks to its 40-inch widescreen and accurate color reproduction. It lacks a variable refresh rate, and HDR support, and has grayish blacks, making it unsuitable for pro gamers.

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Product Snapshot


The Dell UltraSharp U4021QW is a high-end monitor released in 2021 that promises to deliver excellent picture quality thanks to its superb 5K resolution. The monitor features a curved screen that provides wide viewing angles, and with 0.4-inch bezels, the display is very easily adaptable to a multi-screen setup. The monitor’s 40-inch screen offers a wider field of view compared to the 34-inch LG 34GP83A-B, and with the stand’s great ergonomics, users will be able to easily adjust the display according to their preference. Make sure to read through the rest of this Dell UltraSharp U4021QW review to see how well it compares to other top-rated computer monitors.


our Verdict

The Dell U4021QW is a great pick for professionals and designers who need a large screen for increased productivity or color-accurate photo editing. However, gamers should look elsewhere, as this monitor has a low 60Hz refresh rate and doesn’t support FreeSync or Adaptive-Sync technologies. On the plus side, it has wide viewing angles, but its lack of HDR support and grayish blacks mean it’s not ideal for movie-watching.

Reason to Buy

  • High 5K resolution delivers sharp images
  • Ultrawide screen is ideal for multitasking
  • Great ergonomics
  • Wide viewing angles

Reason to Avoid

  • No support for HDR content
  • Low 60Hz refresh rate
  • No support for FreeSync or G-Sync
  • Low contrast ratio and grayish blacks

Dell U4021QW Specs

Display TypeLCD
HDMI Inputs2
HDR Formatn/a
Max Resolution5120 x 2160
Panel TypePanel TypeIPS
Refresh Rate60 Hz
Response TimeResponse Time8 ms
Screen size39.7"
Sync TechnologySync Technologyn/a

All Specs

Test Results

Brightness (nits)256
Contrast Ratio (as ratio, x:1)943
Color Gamut/Accuracy % (DCI P3 xy)0
Color Gamut/Accuracy % (DCI P3 uv)0
Color Gamut % (Adobe RGB Coverage xy)88.5
Color Gamut % (sRGB Coverage xy)100
Color Gamut % (Rec. 2020 Coverage xy)0
Color Gamut % (Rec. 709 Coverage xy)0
Input Lag (ms)8.9
Response Time (ms)6.5
Reflections % (Total Reflections)6.6
Horizontal Viewing Angle (Washout Left)43
Horizontal Viewing Angle (Washout Right)45
Vertical Viewing Angle (Washout Above)30
Vertical Viewing Angle (Washout Below)33

All Tests

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True Score


Any product with a True Score above 70 is a Mixed Reviews

Expert Score Breakdown

  • Rtings

    Category Trust Rating

    The Dell U4021QW is a curved ultrawide UHD display that brings a premium look and… read more


    John Loeffler
  • Techradar

    Category Trust Rating

    The Dell U4021QW is a good all-around monitor. The large size is well-suited to productivity… read more


    Samuel Breton

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