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- Table of Contents
- Top
- Main Differences
- Design
- Picture Quality
- Motion
- Inputs
- Features
- Comments
Dell UltraSharp U4021QW vs Dell U4025QW
Side-by-Side Comparison
Products
Dell UltraSharp U4021QW
Dell U4025QW
Tested using Methodology v1.1
Updated May 03, 2024 05:02 PM
SEE PRICE
Amazon.comTested using Methodology v2.0.1
Updated Feb 19, 2025 04:49 PM
SEE PRICE
Amazon.com
Max Refresh Rate60 Hz
Size40"
Pixel TypeIPS
Native Resolution5120 x 2160
Variable Refresh RateNo VRR
Max Refresh Rate120 Hz
Size40"
Pixel TypeIPS
Native Resolution5120 x 2160
Variable Refresh RateYes
Variants
- UltraSharp U4021QW (40")
- U4025QW (40")
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.
Check Price
40"
UltraSharp U4021QW
SEE PRICE
Amazon.com40"
U4025QW
SEE PRICE
BestBuy.comNotice: Two or more of the products selected have been tested with different test methodologies, so some of the results below aren't directly comparable. Learn how our test benches and scoring system work, and read more about the latest changes to our monitors test methodology.
Main Differences for
Threshold
Mixed Usage
7.5
Full Comparison
Design
Style
Design Picture
Curved
Yes
Yes
Curve Radius
2500R
2500R
Size
40"
40"
Weight (without stand)
20.9 lbs (9.5 kg)
18.5 lbs (8.4 kg)
Weight (with stand)
30.4 lbs (13.8 kg)
25.8 lbs (11.7 kg)
Accelerated Longevity Test
Uniformity Pictures
Longevity Graph
Build Quality
7.0
8.0
Build Quality Picture
Ergonomics
6.4
7.7
Ergonomics Picture
Back Picture
Height Adjustment
4.7" (12.0 cm)
5.9" (15.0 cm)
Min Height To Top Of Panel
18.5" (46.9 cm)
Tilt Range
-20° to 5°
-20° to 5°
Rotate Portrait/Landscape
No
No
Swivel Range
-35° to 35°
-30° to 30°
Wall Mount
VESA 100x100
VESA 100x100
Stand
Stand Picture
Thickness Picture
Base Width
15.2" (38.5 cm)
15.4" (39.0 cm)
Base Depth
9.7" (24.7 cm)
10.0" (25.5 cm)
Thickness (With Display)
8.3" (21.1 cm)
8.1" (20.5 cm)
Weight (With Display)
30.4 lbs (13.8 kg)
25.8 lbs (11.7 kg)
Display
Display Picture
Size
40"
40"
Housing Width
37.8" (96.1 cm)
Housing Height
16.5" (41.9 cm)
Thickness (Without Stand)
4.0" (10.1 cm)
4.1" (10.5 cm)
Weight (Without Stand)
20.9 lbs (9.5 kg)
18.5 lbs (8.4 kg)
Borders Size (Bezels)
0.4" (1.1 cm)
0.4" (1.0 cm)
Controls
Controls Picture
In The Box
In The Box Picture
Power Supply
Internal
Internal
Back
Back Picture
Wall Mount
VESA 100x100
VESA 100x100
Borders
Borders Picture
Borders
0.4" (1.1 cm)
0.4" (1.0 cm)
Thickness
Thickness Picture
Thickness (with stand)
8.3" (21.1 cm)
8.1" (20.5 cm)
Thickness (without stand)
4.0" (10.1 cm)
4.1" (10.5 cm)
Picture Quality
Contrast
5.9
7.1
Checkerboard Picture
Native Contrast
943 : 1
1,918 : 1
Contrast With Local Dimming
N/A
2,011 : 1
Local Dimming
0.0
2.0
Local Dimming Video
Local Dimming
No
Yes
Backlight
Edge
Edge
SDR Brightness
7.1
7.5
Real Scene
256 cd/m²
297 cd/m²
Peak 2% Window
279 cd/m²
287 cd/m²
Peak 10% Window
279 cd/m²
289 cd/m²
Peak 25% Window
280 cd/m²
290 cd/m²
Peak 50% Window
280 cd/m²
291 cd/m²
Peak 100% Window
280 cd/m²
290 cd/m²
Sustained 2% Window
278 cd/m²
287 cd/m²
Sustained 10% Window
279 cd/m²
288 cd/m²
Sustained 25% Window
279 cd/m²
290 cd/m²
Sustained 50% Window
279 cd/m²
290 cd/m²
Sustained 100% Window
280 cd/m²
290 cd/m²
Automatic Brightness Limiting (ABL)
0.000
0.001
Minimum Brightness
26 cd/m²
HDR Brightness
0.0
7.8
EOTF
VESA DisplayHDR Certification
DisplayHDR 600
Real Scene
N/A
619 cd/m²
Peak 2% Window
N/A
559 cd/m²
Peak 10% Window
N/A
588 cd/m²
Peak 25% Window
N/A
591 cd/m²
Peak 50% Window
N/A
597 cd/m²
Peak 100% Window
N/A
601 cd/m²
Sustained 2% Window
N/A
558 cd/m²
Sustained 10% Window
N/A
587 cd/m²
Sustained 25% Window
N/A
590 cd/m²
Sustained 50% Window
N/A
596 cd/m²
Sustained 100% Window
N/A
600 cd/m²
Automatic Brightness Limiting (ABL)
N/A
0.004
Horizontal Viewing Angle
8.0
7.6
Horizontal Viewing Angle Video
Horizontal Chroma Graph
Color Washout From Left
43°
36°
Color Washout From Right
45°
33°
Horizontal Hue Graph
Color Shift From Left
49°
45°
Color Shift From Right
51°
47°
Horizontal Lightness Graph
Brightness Loss From Left
49°
42°
Brightness Loss From Right
51°
39°
Black Level Raise From Left
70°
70°
Black Level Raise From Right
70°
70°
Gamma Shift From Left
40°
45°
Gamma Shift From Right
41°
43°
Vertical Viewing Angle
7.1
6.8
Vertical Viewing Angle Video
Vertical Chroma Graph
Color Washout From Below
33°
29°
Color Washout From Above
30°
29°
Vertical Hue Graph
Color Shift From Below
38°
33°
Color Shift From Above
33°
40°
Vertical Lightness Graph
Brightness Loss From Below
36°
32°
Brightness Loss From Above
32°
33°
Black Level Raise From Below
70°
60°
Black Level Raise From Above
70°
70°
Gamma Shift From Below
43°
32°
Gamma Shift From Above
36°
33°
Gray Uniformity
8.5
7.3
50% Uniformity Picture
50% Std. Dev.
2.994%
2.639%
50% DSE
0.122%
0.190%
5% Uniformity Picture
5% Std. Dev.
0.398%
5% DSE
0.032%
Black Uniformity
6.8
6.7
Native Black Uniformity Picture
Native Std. Dev.
1.434%
1.056%
Black Uniformity Picture With Local Dimming
Std. Dev. w/ L.D.
N/A
4.309%
Color Accuracy (Pre-Calibration)
9.1
9.1
Pre Calibration Picture
Pre Gamma Curve Picture
Pre Color Picture
Picture Mode
Color Space (sRGB)
Color Space (sRGB)
sRGB Gamut Area xy
100.7%
White Balance dE (Avg.)
1.50
2.20
Color Temperature (Avg.)
6,281 K
6,650 K
Gamma (Avg.)
2.16
2.15
Color dE (Avg.)
0.99
1.39
Contrast Setting
75
75
RGB Settings
Default
Default
Gamma Setting
No Gamma Setting
No Gamma Setting
Brightness Setting
75
75
Measured Brightness
210 cd/m²
211 cd/m²
Brightness Locked
No
Color Accuracy (Post-Calibration)
9.7
9.8
Post Calibration Picture
Post Gamma Curve Picture
Post Color Picture
Picture Mode
Custom Color
Custom Color
sRGB Gamut Area xy
99.9%
White Balance dE (Avg.)
0.65
0.61
Color Temperature (Avg.)
6,456 K
6,524 K
Gamma (Avg.)
2.18
2.18
Color dE (Avg.)
0.31
0.35
Contrast Setting
75
75
RGB Settings
98-97-100
Gain (99,96,98), Offset (50,49,50)
Gamma Setting
No Gamma Setting
No Gamma Setting
Brightness Setting
28
37
Measured Brightness
100 cd/m²
101 cd/m²
ICC Profile
SDR Color Gamut
9.4
9.9
sRGB Color Gamut Picture
sRGB Coverage xy
100.0%
99.8%
sRGB Picture Mode
Custom Color
Custom Color
Adobe RGB Color Gamut Picture
Adobe RGB Coverage xy
88.5%
95.6%
Adobe RGB Picture Mode
Custom Color
Custom Color
HDR Color Gamut
0.0
9.1
Wide Color Gamut
N/A
Yes
DCI-P3 Color Gamut Picture
DCI-P3 Coverage xy
96.3%
DCI-P3 Picture Mode
No HDR
DisplayHDR 600
Rec. 2020 Color Gamut Picture
Rec. 2020 Coverage xy
N/A
77.8%
Rec. 2020 Picture Mode
No HDR
DisplayHDR 600
DCI P3 xy
N/A
HDR Color Volume
0.0
8.2
DCI-P3 Color Volume ITP Picture
1,000 cd/m² DCI-P3 Coverage ICtCp
N/A
68.1%
DCI-P3 Picture Mode
No HDR
DisplayHDR 600
Rec. 2020 Color Volume ITP Picture
10,000 cd/m² Rec. 2020 Coverage ICtCp
N/A
38.1%
Rec. 2020 Picture Mode
No HDR
DisplayHDR 600
Text Clarity
9.5
9.0
ClearType On
ClearType Off
Pixel Type
IPS
IPS
Pixels
Subpixel Layout
RGB
RGB
Reflections
6.7
6.5
Average Room
Average Room Off Picture
Bright Room Off Picture
Screen Finish
Matte
Matte
Total Reflections
6.6%
7.2%
Indirect Reflections
3.2%
3.8%
Calculated Direct Reflections
3.4%
3.3%
Gradient
9.8
9.8
Gradient Picture
Color Depth
10 Bit
10 Bit
SDR Color Volume
9.6
sRGB Color Volume ITP Picture
sRGB In ICtCp
98.2%
Adobe RGB Color Volume ITP Picture
Adobe RGB In ICtCp
93.2%
sRGB Picture Mode
Custom Color
Adobe RGB Picture Mode
Custom Color
Image Retention
10
Image Retention Picture
IR After 0 Min Recovery
0.00%
IR After 2 Min Recovery
0.00%
IR After 4 Min Recovery
0.00%
IR After 6 Min Recovery
0.00%
IR After 8 Min Recovery
0.00%
IR After 10 Min Recovery
0.00%
Color Bleed
10
Color Bleed Horizontal
Pixel Row Error
0.001%
Color Bleed Vertical
Pixel Column Error
0.001%
Motion
Refresh Rate
7.1
Native Refresh Rate
60 Hz
120 Hz
Max Refresh Rate
60 Hz
120 Hz
Max Refresh Rate Over DP
120 Hz
Max Refresh Rate Over HDMI
120 Hz
Max Refresh Rate Over DP @ 10-bit
120 Hz
Max Refresh Rate Over HDMI @ 10-Bit
120 Hz
Variable Refresh Rate (VRR)
Variable Refresh Rate
No VRR
Yes
FreeSync
No
Compatible (Tested)
G-SYNC
No
Compatible (Tested)
VRR Maximum
N/A
120 Hz
VRR Minimum
No VRR
< 20 Hz
VRR Supported Connectors
No VRR
DisplayPort, HDMI
Native
60 Hz
120 Hz
Max Refresh Rate
60 Hz
120 Hz
Variable Refresh Rate
No
VRR Motion Performance
5.2
Pursuit Photo VRR
OD Mode CAD Comparison
Recommended VRR OD Setting
Normal
Variable Overdrive Advertised
No
Avg. CAD
371
Best CAD
342
Worst CAD
430
Refresh Rate Compliance
0.8
Fast GTG Sequence
VRR Compliance
Compliance @ Max Hz
29%
Compliance @ 120 FPS
29%
Compliance @ 60 FPS
49%
CAD @ Max Refresh Rate
4.9
Pursuit Photo At Max Refresh
CAD Heatmap At Max Refresh
OD Transition Max Refresh Rate
OD fast
0 to 31
Recommended Overdrive Setting
Normal
Avg. CAD
358
Best 10% CAD
218
Worst 10% CAD
595
Response Time @ Max Refresh Rate
First Response Time
6.5 ms
16.3 ms
Total Response Time
18.7 ms
16.3 ms
Recommended Overdrive Setting
Normal
Normal
RGB Overshoot
7.5%
0 RGB
Worst 10% RGB Overshoot
12.5%
0 RGB
Worst 10% First Response Time
6.6 ms
26.8 ms
Worst 10% Total Response Time
20.3 ms
26.8 ms
Heatmap First Response
Heatmap Total Response
Heatmap RGB Overshoot
Motion Blur Picture
Response Time Table
CAD @ 120Hz
4.9
Pursuit Photo 120Hz
CAD Heatmap 120Hz
OD Transition 120Hz
OD fast
0 to 31
Recommended Overdrive Setting
Normal
Avg. CAD
358
Best 10% CAD
218
Worst 10% CAD
595
Response Time @ 120Hz
Worst 10% First Response Time
26.8 ms
RGB Overshoot
0 RGB
Total Response Time
16.3 ms
First Response Time
16.3 ms
Recommended Overdrive Setting
Normal
Worst 10% Total Response Time
26.8 ms
Worst 10% RGB Overshoot
0 RGB
120Hz First Response Heatmap
120Hz Total Response Heatmap
120Hz Heatmap RGB Overshoot
CAD @ 60Hz
4.6
Pursuit Photo 60Hz
CAD Heatmap 60Hz
OD Transition 60Hz
OD fast
0 to 31
Recommended Overdrive Setting
Normal VRR Off
Avg. CAD
397
Best 10% CAD
248
Worst 10% CAD
578
Response Time @ 60Hz
Recommended Overdrive Setting
Normal
Normal VRR Off
First Response Time
6.5 ms
11.9 ms
Total Response Time
18.7 ms
19.5 ms
RGB Overshoot
7.5%
6 RGB
Worst 10% Total Response Time
20.3 ms
29.1 ms
Worst 10% First Response Time
6.6 ms
19.1 ms
Worst 10% RGB Overshoot
12.5%
16 RGB
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)
No BFI
No BFI
Maximum Frequency
N/A
N/A
Minimum Frequency
N/A
N/A
Longest Pulse Width Brightness
N/A
Shortest Pulse Width Brightness
N/A
Pulse Width Control
No BFI
Pulse Phase Control
No BFI
Pulse Amplitude Control
No BFI
VRR At The Same Time
No BFI
VRR Flicker
9.2
VRR Flicker Video
VRR Flicker Graph
Dark Gray Flicker
0.4 RGB
Middle Gray Flicker
1.1 RGB
Light Gray Flicker
1.6 RGB
Image Flicker
10
10
Backlight Picture
Flicker-Free
Yes
Yes
PWM Dimming Frequency
0 Hz
0 Hz
Response Time @ 60Hz
7.2
Motion Blur Picture
Response Time Table
Best Overdrive Setting
Normal
Normal VRR Off
Rise / Fall Time
6.5 ms
11.9 ms
Total Response Time
18.7 ms
19.5 ms
Overshoot Error
7.5%
6 RGB
Dark Rise / Fall Time
6.6 ms
19.1 ms
Dark Total Response Time
20.3 ms
29.1 ms
Dark Overshoot Error
12.5%
16 RGB
Inputs
Input Lag
9.0
8.8
Native Resolution @ Max Hz
8.9 ms
4.7 ms
Native Resolution @ 120Hz
4.7 ms
Native Resolution @ 60Hz
8.9 ms
8.8 ms
Variable Refresh Rate
N/A
Variable Refresh Rate @ 60Hz
N/A
10 Bit HDR
N/A
Backlight Strobing (BFI)
N/A
N/A
Resolution
9.4
8.6
Native Resolution
5120 x 2160
5120 x 2160
Aspect Ratio
21:9
21:9
Megapixels
11.1 MP
11.1 MP
Pixel Density
137 PPI
140 PPI
Screen Diagonal
40.0"
Screen Area
581 in²
PS5 Compatibility
4.5
PS5 Compatibility Photo
PS5 Compatibility Table
4k @ 120Hz
No
4k @ 60Hz
Yes
1440p @ 120Hz
No
1440p @ 60Hz
Yes
1080p @ 120Hz
No
1080p @ 60Hz
Yes
Xbox Series X|S Compatibility
4.5
XSX Compatibility Photo
XSX Compatibility Table
4k @ 120Hz
No
4k @ 60Hz
Yes
1440p @ 120Hz
No
1440p @ 60Hz
Yes
1080p @ 120Hz
No
1080p @ 60Hz
Yes
Inputs Photos
Inputs 1
Inputs 2
Video And Audio Ports
DisplayPort
1 (DP 1.4)
1 (DP 1.4)
DisplayPort Transmission Bandwidth
No DisplayPort 2.1
Mini DisplayPort
No
No
HDMI
2 (HDMI 2.0)
1 (HDMI 2.1)
HDMI 2.1 Bandwidth
48Gbps (FRL 12x4)
DVI
No
No
VGA
No
No
Daisy Chaining
Thunderbolt
3.5mm Audio Out
1
1
HDR10
No
Yes
3.5mm Audio In
No
3.5mm Microphone In
No
No
DisplayPort Out
No
USB
4 (USB 3.0)
5
USB C
2 (1x Thunderbolt 3, PD, DP Alt Mode, 1x USB 3.2 Gen 2)
5
Digital Optical Audio Out
No
Analog Audio Out RCA
No
Power Supply
Internal
Internal
USB
USB-A Ports
4 (USB 3.0)
5
USB-A Rated Speed
10Gbps (USB 3.2 Gen 2)
USB-B Upstream Port
No
USB-C Ports
2 (1x Thunderbolt 3, PD, DP Alt Mode, 1x USB 3.2 Gen 2)
5
USB-C Upstream
Yes
USB-C Rated Speed
10Gbps (USB 3.2 Gen 2)
USB-C Power Delivery
90W
USB-C DisplayPort Alt Mode
Yes
Thunderbolt
Thunderbolt 4
macOS Compatibility
macOS Screenshot
Features
Additional Features
Speakers
Yes
Yes
RGB Illumination
No
No
Multiple Input Display
PIP + PBP
PIP + PBP
KVM Switch
Yes
HDR10
No
Yes
On-Screen Display (OSD)
OSD Picture
Controls
Controls Picture
In The Box
In The Box Picture
Check Price
40"
UltraSharp U4021QW
SEE PRICE
Amazon.com40"
U4025QW
SEE PRICE
BestBuy.com
Dell UltraSharp U4021QW
Dell U4025QW
Comments
Dell UltraSharp U4021QW vs Dell U4025QW: Main Discussion
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