LG UltraFine 27US550 vs LG UltraFine evo 6K (32U990A)

Every spec side by side, from each maker's published figures.

Only show differences

Better figure, where one is clearly better

Share comparison

UltraFine 27US550 compared with UltraFine evo 6K (32U990A)

	LGUltraFine 27US550	LGUltraFine evo 6K (32U990A)
Overview
Released
Released	November 2024	September 2025
Display
Screen size
Screen size	27″	31.5″
Resolution
Resolution	3840 × 2160 (4K)	6144 × 3456 (6K) (better)
Sharpness
Sharpness	163 pixels per inch	224 pixels per inch (better)
Panel
Panel	IPS	IPS (Nano IPS Black)
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)	300 nits	450 nits (better)
HDR certification
HDR certification	–	DisplayHDR 600
HDR formats
HDR formats	HDR10	HDR10
Contrast ratio
Contrast ratio	1,000:1	2,000:1
Colour range
Colour range	90% DCI-P3 (CIE 1976)	98% DCI-P3, 99.5% Adobe RGB
DCI-P3 coverage
DCI-P3 coverage	90%	98% (better)
Shape
Shape	Flat	Flat
Colour depth
Colour depth	10-bit (8-bit + FRC), 1.07 billion colours	1.07B colours
Adobe RGB coverage
Adobe RGB coverage	–	99.5% (CIE1931, typical), 95% minimum
HDR detail
HDR detail	HDR10, HDR Effect	–
Response time detail
Response time detail	5 ms GtG (Faster mode)	5 ms GtG (Faster mode)
Viewing angles
Viewing angles	178° horizontal, 178° vertical (CR ≥ 10)	178° horizontal, 178° vertical (CR ≥ 10)
Pixel pitch
Pixel pitch	0.1554 x 0.1554 mm	0.1134 × 0.1134 mm
Eye care
Eye care	Flicker Safe, Reader Mode, Color Weakness mode	Flicker Safe, Reader Mode, Auto Brightness
Calibration
Calibration	–	Factory calibrated; hardware calibration ready (LG Calibration Studio)
Connections
Video inputs
Video inputs	2 × HDMI 2.0, DisplayPort 1.4	HDMI 2.1, DisplayPort 2.1 UHBR13.5, Thunderbolt 5
USB-C charging
USB-C charging	None	Up to 96 W (better)
USB ports
USB ports	–	2 × USB-C, Thunderbolt 5
KVM switch
KVM switch	–	Yes
Ethernet
Ethernet	No	No
Speakers
Speakers	No	Yes
HDMI detail
HDMI detail	2 x HDMI 2.0	–
DisplayPort detail
DisplayPort detail	1 x DisplayPort 1.4	DisplayPort 2.1 (UHBR13.5, DSC)
USB-C detail
USB-C detail	–	Thunderbolt 5 input with up to 96 W charging; separate USB-C upstream port for data
Daisy chaining
Daisy chaining	–	Yes, over Thunderbolt 5 (6K at 60 Hz)
USB hub detail
USB hub detail	–	2 × USB-C (USB 3.2 Gen 2, 15 W); upstream via Thunderbolt or USB-C
Picture by picture
Picture by picture	–	PBP (2 inputs), PIP
Speaker detail
Speaker detail	–	2 × 5 W
Audio out
Audio out	3-pole headphone out (sound only)	–
Design
Stand adjusts
Stand adjusts	Height, tilt, swivel, pivot (better)	Height, tilt, pivot
VESA mount
VESA mount	Yes	Yes
Weight with stand
Weight with stand	6.8 kg	9.5 kg
VESA pattern
VESA pattern	100 x 100 mm	100 × 100 mm
Size with stand
Size with stand	613.5 x 539.2 x 253.2 mm (W x H x D, raised)	718.4 × 582.3 × 198.2 mm
Size without stand
Size without stand	613.5 x 363.5 x 45.4 mm (W x H x D)	718.4 × 413.5 × 26.5 mm
Weight without stand
Weight without stand	4.2 kg	6 kg
Colours
Colours	White	–
Power and support
Power use
Power use	25 W typical, 26 W maximum, less than 0.5 W sleep, less than 0.3 W DC off	Less than 1.2 W (sleep), less than 0.3 W (DC off)
Power supply
Power supply	External adapter, 100–240 V AC, 50/60 Hz; 19 V 2.1 A (40 W)	External adapter, 100–240 V AC, 50/60 Hz
Software
Software	LG Switch, Dual Controller	LG Calibration Studio (True Color Pro), Dual Controller
In the box
In the box	Power adapter, HDMI cable (white, 1.5 m)	HDMI, Thunderbolt, USB-C and DisplayPort 2.1 cables