Dell UltraSharp 27 4K Monitor (U2718Q) vs LG UltraFine 27US550

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UltraSharp 27 4K Monitor (U2718Q) compared with UltraFine 27US550

	DellUltraSharp 27 4K Monitor (U2718Q)	LGUltraFine 27US550
Overview
Released
Released	2017	November 2024
Display
Screen size
Screen size	27″	27″
Resolution
Resolution	3840 × 2160 (4K)	3840 × 2160 (4K)
Sharpness
Sharpness	163 pixels per inch	163 pixels per inch
Panel
Panel	IPS	IPS
Refresh rate
Refresh rate	60 Hz	60 Hz
Response time (grey to grey)
Response time (grey to grey)	5 ms	5 ms
Brightness (typical)
Brightness (typical)	350 nits (better)	300 nits
HDR formats
HDR formats	HDR10 through HDMI (Dell HDR)	HDR10
Contrast ratio
Contrast ratio	1,300:1	1,000:1
Colour range
Colour range	99.9% sRGB, 99.9% Rec. 709, 80.7% DCI-P3	90% DCI-P3 (CIE 1976)
DCI-P3 coverage
DCI-P3 coverage	80.7%	90% (better)
Colour accuracy (Delta E)
Colour accuracy (Delta E)	Below 2	–
Screen finish
Screen finish	Matte	–
Shape
Shape	Flat	Flat
Colour depth
Colour depth	1.07 billion colours.	10-bit (8-bit + FRC), 1.07 billion colours
sRGB coverage
sRGB coverage	99.9%	–
Colour accuracy
Colour accuracy	Factory calibrated to average Delta E < 2.	–
Colour modes
Colour modes	99.9% sRGB and Rec. 709; 80.7% DCI-P3.	–
HDR detail
HDR detail	Dell HDR accepts HDR10 from a compatible HDMI source. Dell cautions that its implementation differs from TV HDR standards; independent reviewers found the effect limited.	HDR10, HDR Effect
Response time detail
Response time detail	5 ms grey-to-grey in Fast mode; 8 ms in Normal mode.	5 ms GtG (Faster mode)
Viewing angles
Viewing angles	178° horizontal and vertical (typical).	178° horizontal, 178° vertical (CR ≥ 10)
Pixel pitch
Pixel pitch	0.1554 × 0.1554 mm.	0.1554 x 0.1554 mm
Eye care
Eye care	Flicker-free screen and ComfortView low-blue-light mode, TÜV certified according to Dell.	Flicker Safe, Reader Mode, Color Weakness mode
Connections
Video inputs
Video inputs	HDMI 2.0, 2 × DisplayPort 1.2	2 × HDMI 2.0, DisplayPort 1.4
USB-C charging
USB-C charging	None	None
Ethernet
Ethernet	–	No
USB ports
USB ports	4 × USB-A	–
Speakers
Speakers	No	No
HDMI detail
HDMI detail	One HDMI 2.0 input; the independent HEXUS test found HDR10 input was limited to HDMI.	2 x HDMI 2.0
DisplayPort detail
DisplayPort detail	One DisplayPort 1.2 input and one Mini DisplayPort 1.2 input.	1 x DisplayPort 1.4
USB hub detail
USB hub detail	Four downstream USB 3.0 Type-A ports and one upstream USB 3.0 Type-B port; two downstream ports support BC 1.2 charging at up to 2 A.	–
Audio out
Audio out	Audio line out for external speakers; Dell says it does not support headphones.	3-pole headphone out (sound only)
Design
Stand adjusts
Stand adjusts	Height, tilt, swivel, pivot	Height, tilt, swivel, pivot
VESA mount
VESA mount	Yes	Yes
Weight with stand
Weight with stand	6.55 kg	6.8 kg
Height adjustment
Height adjustment	130 mm.	–
Tilt
Tilt	-5° to 21°.	–
Swivel
Swivel	-45° to 45°.	–
Pivot
Pivot	-90° to 90°.	–
VESA pattern
VESA pattern	100 × 100 mm.	100 x 100 mm
Size with stand
Size with stand	611.3 × 200.3 × 410.2–540.2 mm (width × depth × height).	613.5 x 539.2 x 253.2 mm (W x H x D, raised)
Size without stand
Size without stand	–	613.5 x 363.5 x 45.4 mm (W x H x D)
Weight without stand
Weight without stand	3.70 kg.	4.2 kg
Colours
Colours	–	White
Power and support
Power use
Power use	30 W typical; less than 0.3 W in standby or sleep.	25 W typical, 26 W maximum, less than 0.5 W sleep, less than 0.3 W DC off
Power supply
Power supply	100–240 V AC, 50/60 Hz.	External adapter, 100–240 V AC, 50/60 Hz; 19 V 2.1 A (40 W)
Software
Software	Dell Display Manager with Easy Arrange.	LG Switch, Dual Controller
Warranty
Warranty	Three years of Advanced Exchange Service and limited hardware warranty in Dell's product sheet; regional terms may differ.	–
In the box
In the box	Stand, DisplayPort cable, USB 3.0 upstream cable, power cable, factory calibration report and documentation. Dell's product sheet does not list an HDMI cable.	Power adapter, HDMI cable (white, 1.5 m)