Comparison between Dell U3821DW vs Dell S2721QS

General Info
Model Number	Dell U3821DW	Dell S2721QS

Price	Check on Amazon	Check on Amazon
Type	Monitor	Monitor
Year	2021	2020
Brand	Dell	Dell
Model Series	UltraSharp
Model Number	U3821DW	S2721QS
Display
Screen Size Class	38" (inches)	27" (inches)
Diagonal Size	37.52 in 95.3 cm 952.9 mm 3.13 ft	26.96 in 68.5 cm 684.7 mm 2.25 ft
Screen Width	35.04 in 89 cm 890 mm 2.92 ft	23.49 in 59.7 cm 596.736 mm 1.96 ft
Screen Height	15.27 in 38.8 cm 387.8 mm 1.27 ft	13.22 in 33.6 cm 335.664 mm 1.1 ft
Display Curvature	2300
Display Type	IPS	IPS
Display Bit Depth	10 bits	10 bits
Max Number of Colors	1073741824	1073741824
Bits	30	30
Screen Aspect Ratio	24:10	16:9
Screen Resolution	3840 x 1600	3840 x 2160
Screen Pixel Pitch	0.229 mm	0.155 mm
Screen Pixel Density	109 ppi	163 ppi
Screen-to-Body Ratio	98.38 %	89.83 %
Backlight Source	W-LED	W-LED
DCI P3	95%
sRGB	100 %	99 %
Screen Brightness	300 cd/m²	350 cd/m²
Max Screen Brightness		390 cd/m²
Static Screen Contrast	1000 : 1	1300 : 1
Screen Horizontal Viewing Angle	178 °	178 °
Screen Vertical Viewing Angle	178 °	178 °
Display Minimum Response Time	5 ms	4 ms
Display Average Response Time	8 ms	8 ms
Display Coating	Anti-glare/Matte (3H)	Anti-glare/Matte (3H)
HDR	DisplayHDR 600
3D	No	No
Size, weight, color
Case Depth	4.03 in 10.2 cm 102.4 mm 0.34 ft	2.18 in 5.5 cm 55.4 mm 0.18 ft
Case Weight	8.8 kg 19 lbs	4.7 kg 10 lbs
Case Width with Stand	35.21 in 89.4 cm 894.3 mm 2.93 ft	24.08 in 61.2 cm 611.6 mm 2.01 ft
Case Height with Stand	17.47 in 44.4 cm 443.8 mm 1.46 ft	15.75 in 40 cm 400.1 mm 1.31 ft
Case Depth with Stand	9.89 in 25.1 cm 251.2 mm 0.82 ft	6.88 in 17.5 cm 174.7 mm 0.57 ft
Case Weight with Stand	13.6 kg 30 lbs	6.4 kg 14 lbs
Case Color	Black	Silver
Hardware
Built-in Camera	No	No
Connectivity	1 x USB 3.2 (Type-C; upstream; 90W; DP Alt Mode) 4 x USB 3.2 (Type-A; Gen 1; downstream) 2 x HDMI 2.0 1 x 3.5 mm Audio Out (line-out for speakers) 1 x DisplayPort 1.4 1 x Ethernet RJ45 1 x USB 3.2 (Type-B; Gen 1; upstream) 1 x USB 3.2 (Type-C; downstream)	1 x 3.5 mm Audio Out 2 x HDMI 2.0 1 x DisplayPort 1.2
Audio
Audio Speakers	2 x 9W	2 x 3W
Features
Cool Features	Low Blue Light Picture-by-Picture Picture-in-Picture Flicker-free technology KVM Switch	Flicker-free technology Low Blue Light 3-sided bezeless design AMD FreeSync technology
Extra Features	Security lock slot	Anti-theft stand lock slot - Kensington
Ergonomics
Case Width	35.21 in 89.4 cm 894.3 mm 2.93 ft	24.08 in 61.2 cm 611.6 mm 2.01 ft
Case Height	15.44 in 39.2 cm 392.3 mm 1.29 ft	14.35 in 36.5 cm 364.6 mm 1.2 ft
Vesa Mount Support	Yes	Yes
VESA Interface Standard Size	100 x 100	100 x 100
Removable VESA Stand	Yes	Yes
Height Adjustment	Yes	Yes
Height Adjustment Range	120 mm 12 cm 4.7244 in 0.3937 ft	110 mm 11 cm 4.3307 in 0.3609 ft
Landscape or Portrait Pivot Support	No	Yes
Left Pivot		90 °
Right Pivot		90 °
Left or Right Swivel Support	Yes	Yes
Left Swivel	30 °	30 °
Right Swivel	30 °	30 °
Forward and Backward Tilt Support	Yes	Yes
Forward Tilt	5 °	5 °
Backward Tilt	21 °	21 °
Frequency and Interpolation
Vertical Digital Frequency	56 Hz - 76 Hz	40 Hz - 60 Hz
Horizontal Digital Frequency	30 kHz - 100 kHz	130 kHz - 137 kHz
Screen Interpolation Measurement Unit	NULL	NULL
Accessories
Extras	DisplayPort cable HDMI cable USB Type-C cable USB Type-B 3.2 Gen 1 cable	HDMI cable
Certificates and Standards
Licenses	ENERGY STAR 8.0 EPEAT Gold RoHS TAA Availability TCO Certified Displays	ENERGY STAR 8.0 EPEAT RoHS TCO Certified TUV Flicker Free TUV Low Blue Light
Usage and Storage Requirements
Safe Operating Temperature Level	0 °C - 40 °C 32 °F - 104 °F	0 °C - 40 °C 32 °F - 104 °F
Safe Operating Humidity Level	10 % - 80 %	10 % - 80 %
Internal Storage Temperature	-20 °C - 60 °C -4 °F - 140 °F	-20 °C - 60 °C -4 °F - 140 °F
Internal Storage Humidity	5 % - 90 %	5 % - 90 %
Max Operating Altitude	5000	5000
Max Storage Altitude	12192	12192

Dell U3821DW

Dell S2721QS