Products
Dell U3818DW
Dell UltraSharp U4021QW
Tested using Methodology v1.1
Updated Jun 07, 2024 08:39 PM
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Amazon.com
Tested using Methodology v1.1
Updated Jul 24, 2024 04:00 PM
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Amazon.com
Size38"
Pixel Type
IPS
Variable Refresh Rate
No VRR
Native Resolution3840 x 1600
Max Refresh Rate
60 Hz
Size40"
Pixel Type
IPS
Variable Refresh Rate
No VRR
Native Resolution5120 x 2160
Max Refresh Rate
60 Hz
Our Verdict
Dell U3818DW
Dell UltraSharp U4021QW
The Dell UltraSharp U4021QW is better overall than the Dell U3818DW. That said, they're quite similar in terms of features—neither has HDR support or VRR. The U4021QW is just bigger and has a higher resolution, and it outperforms the U3818DW in other areas. For instance, the U4021QW has a much faster response time, which is great if you want to do some light gaming on the side. It also has a wider color gamut, so it's a bit better for content creation.
Variants
- U3818DW (38")
- UltraSharp U4021QW (40")
Check Price
38"
U3818DW
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40"
UltraSharp U4021QW
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38"
U3818DW
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Walmart.com
40"
UltraSharp U4021QW
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38"
U3818DW
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40"
UltraSharp U4021QW
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38"
U3818DW
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40"
UltraSharp U4021QW
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Main Differences for
Mixed Usage
Mixed Usage
Threshold
Mixed Usage
7.2
7.5
Full Comparison
Design
Style
Design Picture
Size
38"
40"
Curved
Yes
Yes
Curve Radius
2300R
2500R
Weight (without stand)
19.6 lbs (8.9 kg)
20.9 lbs (9.5 kg)
Weight (with stand)
25.4 lbs (11.5 kg)
30.4 lbs (13.8 kg)
Stand
Stand Picture
Width
13.4" (34.0 cm)
15.2" (38.5 cm)
Depth
8.9" (22.6 cm)
9.7" (24.7 cm)
Ergonomics
6.4
6.4
Ergonomics Picture
Height Adjustment
4.7" (11.9 cm)
4.7" (12.0 cm)
Switch Portrait/Landscape
No
No
Swivel Range
-30° to 30°
-35° to 35°
Tilt Range
-20° to 5°
-20° to 5°
Back
Back Picture
Wall Mount
VESA 100x100
VESA 100x100
Borders
Borders Picture
Borders
0.4" (1.0 cm)
0.4" (1.1 cm)
Thickness
Thickness Picture
Thickness (with stand)
6.5" (16.5 cm)
8.3" (21.1 cm)
Thickness (without stand)
3.8" (9.7 cm)
4.0" (10.1 cm)
Build Quality
8.0
7.0
Build Quality Picture
Picture Quality
Contrast
6.2
5.9
Checkerboard Picture
Native Contrast
1,133 : 1
943 : 1
Contrast With Local Dimming
N/A
N/A
Local Dimming
0.0
0.0
Local Dimming Video
Local Dimming
No
No
Backlight
Edge
Edge
SDR Peak Brightness
7.3
7.1
SDR Real Scene
278 cd/m²
256 cd/m²
SDR Peak 2% Window
302 cd/m²
279 cd/m²
SDR Peak 10% Window
302 cd/m²
279 cd/m²
SDR Peak 25% Window
302 cd/m²
280 cd/m²
SDR Peak 50% Window
302 cd/m²
280 cd/m²
SDR Peak 100% Window
302 cd/m²
280 cd/m²
SDR Sustained 2% Window
301 cd/m²
278 cd/m²
SDR Sustained 10% Window
302 cd/m²
279 cd/m²
SDR Sustained 25% Window
302 cd/m²
279 cd/m²
SDR Sustained 50% Window
302 cd/m²
279 cd/m²
SDR Sustained 100% Window
302 cd/m²
280 cd/m²
SDR ABL
0.000
0.000
HDR Peak Brightness
0.0
0.0
HDR Real Scene
N/A
N/A
HDR Peak 2% Window
N/A
N/A
HDR Peak 10% Window
N/A
N/A
HDR Peak 25% Window
N/A
N/A
HDR Peak 50% Window
N/A
N/A
HDR Peak 100% Window
N/A
N/A
HDR Sustained 2% Window
N/A
N/A
HDR Sustained 10% Window
N/A
N/A
HDR Sustained 25% Window
N/A
N/A
HDR Sustained 50% Window
N/A
N/A
HDR Sustained 100% Window
N/A
N/A
HDR ABL
N/A
N/A
Horizontal Viewing Angle
8.1
8.0
Horizontal Viewing Angle Video
Horizontal Chroma Graph
Color Washout From Left
47°
43°
Color Washout From Right
47°
45°
Horizontal Hue Graph
Color Shift From Left
53°
49°
Color Shift From Right
55°
51°
Horizontal Lightness Graph
Brightness Loss From Left
51°
49°
Brightness Loss From Right
51°
51°
Black Level Raise From Left
70°
70°
Black Level Raise From Right
40°
70°
Gamma Shift From Left
46°
40°
Gamma Shift From Right
56°
41°
Vertical Viewing Angle
7.4
7.1
Vertical Viewing Angle Video
Vertical Chroma Graph
Color Washout From Below
34°
33°
Color Washout From Above
35°
30°
Vertical Hue Graph
Color Shift From Below
40°
38°
Color Shift From Above
43°
33°
Vertical Lightness Graph
Brightness Loss From Below
36°
36°
Brightness Loss From Above
37°
32°
Black Level Raise From Below
70°
70°
Black Level Raise From Above
70°
70°
Gamma Shift From Below
41°
43°
Gamma Shift From Above
44°
36°
Gray Uniformity
8.1
8.5
50% Uniformity Picture
50% Std. Dev.
3.831%
2.994%
50% DSE
0.136%
0.122%
5% Uniformity Picture
5% Std. Dev.
0.474%
0.398%
5% DSE
0.045%
0.032%
Black Uniformity
5.8
6.8
Native Black Uniformity Picture
Native Std. Dev.
2.137%
1.434%
Black Uniformity Picture With Local Dimming
Std. Dev. w/ L.D.
N/A
N/A
Pre Calibration
9.0
9.1
Pre Calibration Picture
Pre Gamma Curve Picture
Pre Color Picture
Picture Mode
Standard
Color Space (sRGB)
Luminance
242 cd/m²
210 cd/m²
Luminance Settings
75
75
Contrast Setting
75
75
RGB Controls
100-100-100
Default
Gamma Setting
Default
No Gamma Setting
Color Temperature
6,593 K
6,281 K
White Balance dE
1.67
1.50
Color dE
1.32
0.99
Gamma
2.20
2.16
Post Calibration
9.6
9.7
Post Calibration Picture
Post Gamma Curve Picture
Post Color Picture
Picture Mode
Custom Color
Custom Color
Luminance
102 cd/m²
100 cd/m²
Luminance Settings
23
28
Contrast Setting
75
75
RGB Controls
100-99-98
98-97-100
Gamma Setting
Default
No Gamma Setting
Color Temperature
6,420 K
6,456 K
White Balance dE
0.67
0.65
Color dE
0.54
0.31
Gamma
2.17
2.18
SDR Color Gamut
8.9
9.4
Color Gamut sRGB Picture
sRGB xy
99.0%
100.0%
Color Gamut ARGB Picture
Adobe RGB xy
77.6%
88.5%
sRGB Picture Mode
Custom Color
Custom Color
Adobe RGB Picture Mode
Custom Color
Custom Color
SDR Color Volume
9.1
9.6
sRGB Color Volume ITP Picture
sRGB In ICtCp
97.8%
98.2%
Adobe RGB Color Volume ITP Picture
Adobe RGB In ICtCp
83.0%
93.2%
sRGB Picture Mode
Custom Color
Custom Color
Adobe RGB Picture Mode
Custom Color
Custom Color
HDR Color Gamut
0.0
0.0
Wide Color Gamut
No
N/A
Color Gamut DCI-P3 Picture
DCI P3 xy
N/A
N/A
Color Gamut Rec.2020 Picture
Rec. 2020 xy
N/A
N/A
DCI P3 Picture Mode
No HDR
No HDR
Rec. 2020 Picture Mode
No HDR
No HDR
HDR Color Volume
0.0
0.0
P3 Color Volume ITP Picture
DCI-P3 In ICtCp
N/A
N/A
2020 Color Volume ITP Picture
Rec. 2020 In ICtCp
N/A
N/A
DCI P3 Picture Mode
No HDR
No HDR
Rec. 2020 Picture Mode
No HDR
No HDR
Image Retention
10
10
Image Retention Picture
IR After 0 Min Recovery
0.00%
0.00%
IR After 2 Min Recovery
0.00%
0.00%
IR After 4 Min Recovery
0.00%
0.00%
IR After 6 Min Recovery
0.00%
0.00%
IR After 8 Min Recovery
0.00%
0.00%
IR After 10 Min Recovery
0.00%
0.00%
Gradient
9.4
9.8
Gradient Picture
Color Depth
10 Bit
10 Bit
Color Bleed
10
10
Color Bleed Horizontal
Pixel Row Error
0.000%
0.001%
Color Bleed Vertical
Pixel Column Error
0.001%
0.001%
Reflections
6.4
6.7
Average Room
Average Room Off Picture
Bright Room Off Picture
Screen Finish
Matte
Matte
Total Reflections
7.5%
6.6%
Indirect Reflections
4.3%
3.2%
Calculated Direct Reflections
3.2%
3.4%
Text Clarity
7.0
9.5
ClearType On
Pixel Type
IPS
IPS
ClearType Off
Pixels
Sub-Pixel Layout
RGB
RGB
Motion
Response Time @ Max Refresh Rate
4.9
7.2
Motion Blur Picture
Response Time Table
Best Overdrive Setting
Normal
Normal
Rise / Fall Time
6.6 ms
6.5 ms
Total Response Time
26.0 ms
18.7 ms
Overshoot Error
17.6%
7.5%
Dark Rise / Fall Time
6.5 ms
6.6 ms
Dark Total Response Time
25.3 ms
20.3 ms
Dark Overshoot Error
18.7%
12.5%
Response Time @ 60Hz
4.9
7.2
Motion Blur Picture
Response Time Table
Best Overdrive Setting
Normal
Normal
Rise / Fall Time
6.6 ms
6.5 ms
Total Response Time
26 ms
18.7 ms
Overshoot Error
17.6%
7.5%
Dark Rise / Fall Time
6.5 ms
6.6 ms
Dark Total Response Time
25.3 ms
20.3 ms
Dark Overshoot Error
18.7%
12.5%
Image Flicker
10
10
Backlight Picture
Flicker-Free
Yes
Yes
PWM Dimming Frequency
0 Hz
0 Hz
Black Frame Insertion (BFI)
0.0
0.0
Black Frame Insertion (BFI)
No
No BFI
BFI Picture
BFI Frequency Picture
BFI Maximum Frequency
N/A
N/A
BFI Minimum Frequency
N/A
N/A
Refresh Rate
5.9
5.9
Variable Refresh Rate
No VRR
No VRR
Native
60 Hz
60 Hz
Max Refresh Rate
60 Hz
60 Hz
Variable Refresh Rate
No
No
FreeSync
No
No
G-SYNC
No
No
VRR Maximum
N/A
N/A
VRR Minimum
No VRR
No VRR
VRR Supported Connectors
No VRR
No VRR
Inputs
Input Lag
8.9
9.0
Native Resolution
9.2 ms
8.9 ms
Native Resolution @ 60Hz
9.2 ms
8.9 ms
Variable Refresh Rate
N/A
N/A
Variable Refresh Rate @ 60Hz
N/A
N/A
10 Bit HDR
N/A
N/A
Black Frame Insertion (BFI)
N/A
N/A
Resolution And Size
8.9
9.4
Native Resolution
3840 x 1600
5120 x 2160
Aspect Ratio
21:9
21:9
Megapixels
6.1 MP
11.1 MP
Pixel Density
111 PPI
137 PPI
Screen Diagonal
37.5"
40.0"
Screen Area
498 in²
581 in²
Inputs
Inputs 1
Inputs 2
Total Inputs
DisplayPort
1 (DP 1.2)
1 (DP 1.4)
Mini DisplayPort
No
No
HDMI
2 (HDMI 2.0)
2 (HDMI 2.0)
DVI
No
No
VGA
No
No
DisplayPort Out
No
No
USB
4 (USB 3.0)
4 (USB 3.0)
USB C
1 (USB, USB PD, DP Alt Mode)
2 (1x Thunderbolt 3, PD, DP Alt Mode, 1x USB 3.2 Gen 2)
Analog Audio Out 3.5mm
1
1
Microphone In 3.5mm
No
No
Digital Optical Audio Out
No
No
Analog Audio Out RCA
No
No
Power Supply
Internal
Internal
Features
Additional Features
RGB Illumination
No
No
Speakers
Yes
Yes
HDR10
No
No
Multiple Input Display
PIP + PBP
PIP + PBP
On-Screen Display (OSD)
OSD Picture
Controls
Controls Picture
In The Box
In The Box Picture
Check Price
38"
U3818DW
SEE PRICE
Amazon.com
40"
UltraSharp U4021QW
SEE PRICE
Amazon.com
38"
U3818DW
SEE PRICE
Walmart.com
40"
UltraSharp U4021QW
SEE PRICE
Walmart.com
38"
U3818DW
SEARCH
B&H
40"
UltraSharp U4021QW
SEARCH
B&H
38"
U3818DW
SEARCH
BestBuy.com
40"
UltraSharp U4021QW
SEARCH
BestBuy.com
Dell U3818DW
Dell UltraSharp U4021QW
Comments
Dell U3818DW vs Dell UltraSharp U4021QW: Main Discussion
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