Comparison between Dell S2721HN vs Dell U2421HE

General Info
Model Number	Dell S2721HN	Dell U2421HE

Price	Check on Amazon	Check on Amazon
Type	Monitor	Monitor
Year	2020	2020
Brand	Dell	Dell
Model Number	S2721HN	U2421HE
Alias	S2721NX
Display
Screen Size Class	27" (inches)	24" (inches)
Diagonal Size	27 in 68.6 cm 685.891 mm 2.25 ft	23.81 in 60.5 cm 604.7 mm 1.98 ft
Screen Width	23.54 in 59.8 cm 597.89 mm 1.96 ft	20.75 in 52.7 cm 527.04 mm 1.73 ft
Screen Height	13.24 in 33.6 cm 336.312 mm 1.1 ft	11.67 in 29.6 cm 296.46 mm 0.97 ft
Display Type	IPS	IPS
Display Bit Depth	8 bits	8 bits
Max Number of Colors	16777216	16777216
Bits	24	24
Screen Aspect Ratio	16:9	16:9
Screen Resolution	1920 x 1080	1920 x 1080
Screen Pixel Pitch	0.311 mm	0.275 mm
Screen Pixel Density	81 ppi	92 ppi
Screen-to-Body Ratio	90.67 %	92.49 %
Backlight Source	W-LED	W-LED
DCI P3		89%
sRGB		99 %
NTSC 1953	72 %
Screen Brightness	300 cd/m²	250 cd/m²
Static Screen Contrast	1000 : 1	1000 : 1
Screen Horizontal Viewing Angle	178 °	178 °
Screen Vertical Viewing Angle	178 °	178 °
Display Minimum Response Time	4 ms	5 ms
Display Average Response Time	8 ms	8 ms
Display Coating	Anti-glare/Matte (3H)	Anti-glare/Matte (3H)
3D	No	No
Size, weight, color
Case Depth	2.13 in 5.4 cm 54 mm 0.18 ft	1.54 in 3.9 cm 39 mm 0.13 ft
Case Weight	4.3 kg 9 lbs	3.37 kg 7 lbs
Case Width with Stand	24.01 in 61 cm 609.9 mm 2 ft	21.2 in 53.9 cm 538.5 mm 1.77 ft
Case Height with Stand	17.85 in 45.3 cm 453.3 mm 1.49 ft	13.72 in 34.8 cm 348.4 mm 1.14 ft
Case Depth with Stand	7.35 in 18.7 cm 186.8 mm 0.61 ft	6.5 in 16.5 cm 165 mm 0.54 ft
Case Weight with Stand	5.2 kg 11 lbs	5.32 kg 12 lbs
Case Color	Black, Silver	Black
Hardware
Built-in Camera	No	No
Connectivity	2 x HDMI 1.4 1 x 3.5 mm Audio Out	1 x USB 3.1 (Type-C; upstream; DP; 65W) 1 x Ethernet RJ45 1 x DisplayPort 1.4 1 x 3.5 mm Audio Out 1 x DisplayPort 1.4 (Output MST) 1 x HDMI 1.4 2 x USB 3.0 (downstream) 2 x USB 3.0 (downstream; BC 1.2)
Audio
Features
Cool Features	Flicker-free technology Low Blue Light 3-sided bezeless design AMD FreeSync technology	Flicker-free technology Low Blue Light
Extra Features	Anti-theft stand lock slot - Kensington S2721HN - silver S2721NX - black	Security lock slot
Ergonomics
Case Width	24.01 in 61 cm 609.9 mm 2 ft	21.2 in 53.9 cm 538.5 mm 1.77 ft
Case Height	14.31 in 36.4 cm 363.6 mm 1.19 ft	12.35 in 31.4 cm 313.7 mm 1.03 ft
Vesa Mount Support	Yes	Yes
VESA Interface Standard Size	100 x 100	100 x 100
Removable VESA Stand	Yes	Yes
Height Adjustment	No	Yes
Height Adjustment Range		130 mm 13 cm 5.1181 in 0.4265 ft
Landscape or Portrait Pivot Support	No	Yes
Left Pivot		90 °
Right Pivot		90 °
Left or Right Swivel Support	No	Yes
Left Swivel		40 °
Right Swivel		40 °
Forward and Backward Tilt Support	Yes	Yes
Forward Tilt	5 °	5 °
Backward Tilt	21 °	21 °
Frequency and Interpolation
Vertical Digital Frequency	48 Hz - 75 Hz	56 Hz - 76 Hz
Horizontal Digital Frequency	30 kHz - 83 kHz	30 kHz - 83 kHz
Screen Interpolation Measurement Unit	NULL	NULL
Accessories
Extras	HDMI cable	DisplayPort cable USB Type-C to Type-C cable
Certificates and Standards
Licenses	ENERGY STAR 8.0 EPEAT RoHS TCO Certified TUV Flicker Free TUV Low Blue Light	ENERGY STAR EPEAT TCO Certified RoHS NFPA 99
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 S2721HN

Dell U2421HE