Products
Dell UltraSharp U4021QW
Dell U4025QW
Tested using Methodology v1.1
Updated Jul 24, 2024 04:00 PM
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Amazon.com
Tested using Methodology v2.1.2
Updated Mar 17, 2026 03:34 PM
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Dell
Size
40"
Panel Type
IPS
Native Resolution
5120 x 2160
Max Refresh Rate
60 Hz
Variable Refresh Rate
No VRR
Size
40"
Panel Type
LCD
Native Resolution
5120 x 2160
Max Refresh Rate
120 Hz
Sub-Type
IPS
Variable Refresh Rate
Our Verdict
Dell UltraSharp U4021QW
Dell U4025QW
The Dell UltraSharp U4021QW and the Dell U4025QW are extremely similar 40-inch ultrawide productivity monitors. However, the U4025QW is a better monitor with far better image quality. With the U4025QW, deep blacks appear less gray in a dark room, colors on the display are richer and more vibrant, and it has a more responsive feel thanks to its 120Hz display. The U4021QW also doesn't allow you to subdivide the screen into multiple smaller virtual monitors for easier window management.
Variants
- UltraSharp U4021QW (40")
- U4025QW (40")
Check Price
40"
UltraSharp U4021QW
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Amazon.com
40"
U4025QW
SEE PRICE
Dell
40"
UltraSharp U4021QW
SEE PRICE
Walmart.com
40"
U4025QW
SEE PRICE
Amazon.com
40"
UltraSharp U4021QW
SEARCH
B&H
40"
U4025QW
SEE PRICE
B&H
40"
UltraSharp U4021QW
SEARCH
BestBuy.com
40"
U4025QW
SEE PRICE
BestBuy.com
40"
UltraSharp U4021QW
SEARCH
Dell
40"
U4025QW
SEE PRICE
Walmart.com
Main Differences for
Mixed Usage
Mixed Usage
Threshold
Mixed Usage
Full Comparison
Design
Style
Design Picture
Curved
Curve Radius
Size
Weight (without stand)
Weight (with stand)
Build Quality
Build Quality Picture
Ergonomics
Ergonomics Picture
Back Picture
Height Adjustment
Min Height To Top Of Panel
Tilt Range
Rotate Portrait/Landscape
Swivel Range
Wall Mount
Stand
Stand Picture
Thickness Picture
Base Width
Base Depth
Thickness (With Display)
Weight (With Display)
Display
Display Picture
Size
Housing Width
Housing Height
Thickness (Without Stand)
Weight (Without Stand)
Borders Size (Bezels)
Controls
Controls Picture
In The Box
In The Box Picture
Power Supply
Back
Back Picture
Wall Mount
Borders
Borders Picture
Borders
Thickness
Thickness Picture
Thickness (with stand)
Thickness (without stand)
Picture Quality
Contrast
Checkerboard Picture
Native Contrast
Contrast With Local Dimming
Local Dimming
Local Dimming Video
Local Dimming
Backlight
SDR Brightness
Real Scene
Peak 2% Window
Peak 10% Window
Peak 25% Window
Peak 50% Window
Peak 100% Window
Sustained 2% Window
Sustained 10% Window
Sustained 25% Window
Sustained 50% Window
Sustained 100% Window
Automatic Brightness Limiting (ABL)
Minimum Brightness
HDR Brightness
EOTF
VESA DisplayHDR Certification
Real Scene
Peak 2% Window
Peak 10% Window
Peak 25% Window
Peak 50% Window
Peak 100% Window
Sustained 2% Window
Sustained 10% Window
Sustained 25% Window
Sustained 50% Window
Sustained 100% Window
Automatic Brightness Limiting (ABL)
Gray Uniformity
50% Uniformity Picture
50% Std. Dev.
50% DSE
5% Uniformity Picture
5% Std. Dev.
5% DSE
Black Uniformity
Native Black Uniformity Picture
Native Std. Dev.
Black Uniformity Picture With Local Dimming
Std. Dev. w/ L.D.
Color Accuracy (Pre-Calibration)
Pre Calibration Picture
Pre Gamma Curve Picture
Pre Color Picture
Picture Mode
sRGB Gamut Area xy
White Balance dE (Avg.)
Color Temperature (Avg.)
Gamma (Avg.)
Color dE (Avg.)
Contrast Setting
RGB Settings
Gamma Setting
Brightness Setting
Measured Brightness
Brightness Locked
Color Accuracy (Post-Calibration)
Post Calibration Picture
Post Gamma Curve Picture
Post Color Picture
Picture Mode
sRGB Gamut Area xy
White Balance dE (Avg.)
Color Temperature (Avg.)
Gamma (Avg.)
Color dE (Avg.)
Contrast Setting
RGB Settings
Gamma Setting
Brightness Setting
Measured Brightness
ICC Profile
SDR Color Gamut
sRGB Color Gamut Picture
sRGB Coverage xy
sRGB Picture Mode
Adobe RGB Color Gamut Picture
Adobe RGB Coverage xy
Adobe RGB Picture Mode
HDR Color Gamut
Wide Color Gamut
DCI-P3 Color Gamut Picture
DCI-P3 Coverage xy
DCI-P3 Picture Mode
Rec. 2020 Color Gamut Picture
Rec. 2020 Coverage xy
Rec. 2020 Picture Mode
DCI P3 xy
HDR Color Volume
DCI-P3 Color Volume ITP Picture
1,000 cd/m² DCI-P3 Coverage ICtCp
DCI-P3 Picture Mode
Rec. 2020 Color Volume ITP Picture
10,000 cd/m² Rec. 2020 Coverage ICtCp
Rec. 2020 Picture Mode
Viewing Angle
Viewing Angle Video
Chroma Graph
Color Washout From Left
Color Washout From Right
Hue Graph
Color Shift From Left
Color Shift From Right
Lightness Graph
Brightness Loss From Left
Brightness Loss From Right
Black Level Raise From Left
Black Level Raise From Right
Gamma Shift From Left
Gamma Shift From Right
Text Clarity
ClearType On
ClearType Off
Pixel Type
Pixels
Sub-Pixel Layout
Panel Technology
Spectral Power Distribution
Pixels
Panel Type
Sub-Type
Subpixel Layout
Direct Reflections
Ring Light Picture
Direct Reflections Graph
Peak Direct Reflection Intensity
Screen Finish
Ambient Black Level Raise
Black Level Raise Picture
Ambient Black Level Raise Graph
Black Luminance @ 0 lx
Black Luminance @ 1000 lx
Total Reflected Light
Bright Room Off Picture
Total Reflection Ring Light Picture
Total Reflected Light Intensity
Diffraction Artifacts
Gradient
Gradient Picture
Color Depth
Vertical Viewing Angle
Vertical Viewing Angle Video
Vertical Chroma Graph
Color Washout From Below
Color Washout From Above
Vertical Hue Graph
Color Shift From Below
Color Shift From Above
Vertical Lightness Graph
Brightness Loss From Below
Brightness Loss From Above
Black Level Raise From Below
Black Level Raise From Above
Gamma Shift From Below
Gamma Shift From Above
SDR Color Volume
sRGB Color Volume ITP Picture
sRGB In ICtCp
Adobe RGB Color Volume ITP Picture
Adobe RGB In ICtCp
sRGB Picture Mode
Adobe RGB Picture Mode
Image Retention
Image Retention Picture
IR After 0 Min Recovery
IR After 2 Min Recovery
IR After 4 Min Recovery
IR After 6 Min Recovery
IR After 8 Min Recovery
IR After 10 Min Recovery
Color Bleed
Color Bleed Horizontal
Pixel Row Error
Color Bleed Vertical
Pixel Column Error
Reflections
Average Room
Average Room Off Picture
Bright Room Off Picture
Screen Finish
Total Reflections
Indirect Reflections
Calculated Direct Reflections
Motion
Refresh Rate
Dual Mode Setting
Native Refresh Rate
Max Refresh Rate
Max Refresh Rate Over DP
Max Refresh Rate Over HDMI
Max Refresh Rate Over DP @ 10-bit
Max Refresh Rate Over HDMI @ 10-Bit
DSC Toggle
DSC Off Max Refresh Rate Over DP
DSC Off Max Refresh Rate Over HDMI
Variable Refresh Rate (VRR)
Variable Refresh Rate
FreeSync
G-SYNC
VRR Maximum
VRR Minimum
VRR Supported Connectors
Native
Max Refresh Rate
Variable Refresh Rate
VRR Motion Performance
Pursuit Photo VRR
OD Mode CAD Comparison
Recommended VRR OD Setting
Variable Overdrive Advertised
Avg. CAD
Best CAD
Worst CAD
Refresh Rate Compliance
Fast GTG Sequence
VRR Compliance
Compliance @ Max Hz
Compliance @ 120 FPS
Compliance @ 60 FPS
CAD @ Max Refresh Rate
Pursuit Photo At Max Refresh
CAD Heatmap At Max Refresh
OD Transition Max Refresh Rate
Recommended Overdrive Setting
Avg. CAD
Best 10% CAD
Worst 10% CAD
Response Time @ Max Refresh Rate
First Response Time
Total Response Time
Recommended Overdrive Setting
RGB Overshoot
Worst 10% RGB Overshoot
Worst 10% First Response Time
Worst 10% Total Response Time
Heatmap First Response
Heatmap Total Response
Heatmap RGB Overshoot
Motion Blur Picture
Response Time Table
CAD @ 120Hz
Pursuit Photo 120Hz
CAD Heatmap 120Hz
OD Transition 120Hz
Recommended Overdrive Setting
Avg. CAD
Best 10% CAD
Worst 10% CAD
Response Time @ 120Hz
Worst 10% First Response Time
RGB Overshoot
Total Response Time
First Response Time
Recommended Overdrive Setting
Worst 10% Total Response Time
Worst 10% RGB Overshoot
120Hz First Response Heatmap
120Hz Total Response Heatmap
120Hz Heatmap RGB Overshoot
CAD @ 60Hz
Pursuit Photo 60Hz
CAD Heatmap 60Hz
OD Transition 60Hz
Recommended Overdrive Setting
Avg. CAD
Best 10% CAD
Worst 10% CAD
Response Time @ 60Hz
Recommended Overdrive Setting
First Response Time
Total Response Time
RGB Overshoot
Worst 10% Total Response Time
Worst 10% First Response Time
Worst 10% RGB Overshoot
60Hz First Response Heatmap
60Hz Total Response Heatmap
60Hz RGB Overshoot Heatmap
Backlight Strobing (BFI)
Backlight Strobing Picture
Backlight Strobing Frequency Picture
Backlight Strobing (BFI)
Maximum Frequency
Minimum Frequency
Longest Pulse Width Brightness
Shortest Pulse Width Brightness
Pulse Width Control
Pulse Phase Control
Pulse Amplitude Control
VRR At The Same Time
VRR Flicker
VRR Flicker Video
VRR Flicker Graph
Dark Gray Flicker
Middle Gray Flicker
Light Gray Flicker
VRR Flicker Control Setting
Image Flicker
Backlight Picture
Flicker-Free
PWM Dimming Frequency
Response Time @ 60Hz
Motion Blur Picture
Response Time Table
Best Overdrive Setting
Rise / Fall Time
Total Response Time
Overshoot Error
Dark Rise / Fall Time
Dark Total Response Time
Dark Overshoot Error
Inputs
Input Lag
Native Resolution @ Max Hz
Native Resolution @ 120Hz
Native Resolution @ 60Hz
Variable Refresh Rate
Variable Refresh Rate @ 60Hz
10 Bit HDR
Backlight Strobing (BFI)
Resolution
Native Resolution
Aspect Ratio
Megapixels
Pixel Density
Screen Diagonal
Screen Area
PS5 Compatibility
PS5 Compatibility Photo
PS5 Compatibility Table
4k @ 120Hz
4k @ 60Hz
1440p @ 120Hz
1440p @ 60Hz
1080p @ 120Hz
1080p @ 60Hz
Xbox Series X|S Compatibility
XSX Compatibility Photo
XSX Compatibility Table
4k @ 120Hz
4k @ 60Hz
1440p @ 120Hz
1440p @ 60Hz
1080p @ 120Hz
1080p @ 60Hz
Inputs
Inputs 1
Inputs 2
Inputs
Inputs 1
Inputs 2
DisplayPort
DisplayPort Transmission Bandwidth
Mini DisplayPort
HDMI
HDMI 2.1 Bandwidth
Daisy Chaining
3.5mm Audio Out
Ethernet
HDR10
Dolby Vision
DVI
VGA
DisplayPort Out
USB
USB C
Microphone In 3.5mm
Digital Optical Audio Out
Analog Audio Out RCA
Power Supply
USB
USB-A Ports
USB-A Rated Speed
USB-B Upstream Port
USB-C Ports
USB-C Upstream
USB-C Rated Speed
USB-C Power Delivery
USB-C DisplayPort Alt Mode
Thunderbolt
macOS Compatibility
macOS Screenshot
Features
Additional Features
Speakers
RGB Illumination
Multiple Input Display
KVM Switch
Smart OS
HDR10
On-Screen Display (OSD)
OSD Picture
Controls
Controls Picture
In The Box
In The Box Picture
Check Price
40"
UltraSharp U4021QW
SEE PRICE
Amazon.com
40"
U4025QW
SEE PRICE
Dell
40"
UltraSharp U4021QW
SEE PRICE
Walmart.com
40"
U4025QW
SEE PRICE
Amazon.com
40"
UltraSharp U4021QW
SEARCH
B&H
40"
U4025QW
SEE PRICE
B&H
40"
UltraSharp U4021QW
SEARCH
BestBuy.com
40"
U4025QW
SEE PRICE
BestBuy.com
40"
UltraSharp U4021QW
SEARCH
Dell
40"
U4025QW
SEE PRICE
Walmart.com
Dell UltraSharp U4021QW
Dell U4025QW
Comments
Dell UltraSharp U4021QW vs Dell U4025QW: Main Discussion
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