Comparison between Dell U4021QW vs Samsung C34J791

General Info
Model Number	Dell U4021QW	Samsung C34J791

Price	Check on Amazon	Check on Amazon
Type	Monitor	Monitor
Year	2021	2018
Brand	Dell	Samsung
Model Number	U4021QW	C34J791
Alias		LC34J791WTEXXS
Display
Screen Size Class	40" (inches)	34" (inches)
Diagonal Size		34 in 86.4 cm 863.6 mm 2.83 ft
Screen Width	37.27 in 94.7 cm 946.6 mm 3.11 ft	31.49 in 80 cm 799.8 mm 2.62 ft
Screen Height		13.18 in 33.5 cm 334.8 mm 1.1 ft
Display Curvature	2500	1500
Display Manufacturer		Samsung
Display Type	IPS	SVA
Display Bit Depth	10 bits	8 bits
Frame Rate Control		No
Max Number of Colors	1073741824	16777216
Bits	30	24
Screen Aspect Ratio	21:9	21:9
Screen Resolution	5120 x 2160	3440 x 1440
Screen Pixel Pitch		0.233 mm
Screen Pixel Density		109 ppi
Screen-to-Body Ratio		91.27 %
Backlight Source	W-LED	Edge LED
DCI P3	98%
sRGB	100 %	125 %
Adobe RGB 1998		92 %
Screen Brightness	300 cd/m²	300 cd/m²
Static Screen Contrast	1000 : 1	3000 : 1
Dynamic Screen Contrast		100000000 : 1
Screen Horizontal Viewing Angle	178 °	178 °
Screen Vertical Viewing Angle	178 °	178 °
Screen Input Lag		6 ms
Display Minimum Response Time	5 ms	4 ms
Display Average Response Time	8 ms	14 ms
Display Coating	Anti-glare/Matte (3H)	Anti-glare/Matte (2H)
3D	No	No
Size, weight, color
Case Depth		6.57 in 16.7 cm 167 mm 0.55 ft
Case Weight		6.3 kg 14 lbs
Case Width with Stand	37.27 in 94.7 cm 946.6 mm 3.11 ft	31.84 in 80.9 cm 808.7 mm 2.65 ft
Case Height with Stand	18.02 in 45.8 cm 457.8 mm 1.5 ft	20.31 in 51.6 cm 516 mm 1.69 ft
Case Depth with Stand	9.76 in 24.8 cm 248 mm 0.81 ft	12.18 in 30.9 cm 309.4 mm 1.02 ft
Case Weight with Stand	9.5 kg 21 lbs	7.7 kg 17 lbs
Case Color	Black	White, Silver
Hardware
Built-in Camera	No	No
Connectivity	1 x USB 3.2 (Type-C; downstream; 15W) 1 x Ethernet RJ45 (Gigabit) 1 x DisplayPort 1.4 1 x 3.5 mm Audio Out (line-out for speakers) 1 x Thunderbolt 3.0 (Type-C; upstream; 90W; DP Alt Mode) 2 x HDMI 2.0 4 x USB 3.2 (Type-A; Gen 1; downstream) 1 x USB 3.2 (Type-B; Gen 1; upstream)	1 x DisplayPort 1.2 2 x Thunderbolt 3.0 1 x 3.5 mm Audio Out 2 x USB 2.0 (downstream) 1 x HDMI 1.4
Audio
Audio Speakers	2 x 9W	2 x 7W
Features
Cool Features	KVM Switch Low Blue Light Picture-in-Picture Picture-by-Picture ComfortView Plus Flicker-free technology	Eye Saver Mode Flicker-free technology Picture-by-Picture Picture-in-Picture HDCP (High-bandwidth Digital Content Protection) AMD FreeSync technology Eco Saving Plus
Extra Features	Security lock slot	Anti-theft stand lock slot - Kensington
Ergonomics
Case Width		31.84 in 80.9 cm 808.7 mm 2.65 ft
Case Height		14.28 in 36.3 cm 362.8 mm 1.19 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	100 mm 10 cm 3.937 in 0.3281 ft
Landscape or Portrait Pivot Support	No	No
Left or Right Swivel Support	Yes	No
Left Swivel	30 °
Right Swivel	30 °
Forward and Backward Tilt Support	Yes	Yes
Forward Tilt	5 °	2 °
Backward Tilt	21 °	34 °
Frequency and Interpolation
Vertical Digital Frequency	60 Hz	48 Hz - 100 Hz
Horizontal Digital Frequency		30 kHz - 152 kHz
Screen Interpolation Measurement Unit	NULL
Accessories
Extras	DisplayPort cable HDMI cable Thunderbolt 4 (USB-C) Active Cable USB Type-A to Type-B cable
Certificates and Standards
Licenses		ENERGY STAR FCC Class B ISO9241-307 TÜV/Ergonomics
Usage and Storage Requirements
Safe Operating Temperature Level	0 °C - 40 °C 32 °F - 104 °F	10 °C - 40 °C 50 °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 % - 95 %
Max Operating Altitude	5000
Max Storage Altitude	12192

Dell U4021QW

Samsung C34J791