LG UltraGear 27G850A-B vs LG UltraGear evo GX9 (39GX950B)

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UltraGear 27G850A-B compared with UltraGear evo GX9 (39GX950B)

	LGUltraGear 27G850A-B	LGUltraGear evo GX9 (39GX950B)
Overview
Released
Released	February 2025	June 2026
Display
Screen size
Screen size	27″	38.9″
Resolution
Resolution	3840 × 2160 (4K)	5120 × 2160 (5K2K) (better)
Sharpness
Sharpness	163 pixels per inch (better)	143 pixels per inch
Panel
Panel	IPS (Nano IPS Black; dual mode switches to 1920 x 1080 at 480Hz)	OLED (4th-gen Primary RGB Tandem WOLED; Dual mode: 2560 x 1080 at 330 Hz)
Refresh rate
Refresh rate	240 Hz (better)	165 Hz
Response time (grey to grey)
Response time (grey to grey)	1 ms	0.03 ms (better)
Brightness (typical)
Brightness (typical)	450 nits (better)	335 nits
HDR peak brightness
HDR peak brightness	–	1,500 nits
HDR certification
HDR certification	DisplayHDR 600	DisplayHDR True Black 500
HDR formats
HDR formats	HDR10	HDR10
Contrast ratio
Contrast ratio	2,000:1	1,850,000:1
Colour range
Colour range	99% DCI-P3 (CIE 1976)	99.5% DCI-P3
DCI-P3 coverage
DCI-P3 coverage	99%	99.5% (better)
Screen finish
Screen finish	–	Matte
Shape
Shape	Flat	Curved (1500R)
Adaptive sync
Adaptive sync	G-Sync Compatible, FreeSync Premium Pro, VESA AdaptiveSync	G-Sync Compatible, FreeSync Premium Pro
Colour depth
Colour depth	1.07 billion colours; 8-bit plus FRC (PCW and DisplayNinja)	1.07B colours
HDR detail
HDR detail	Eight dimming zones (PCW and DisplayNinja); LG Korea lists 750 nits typical peak brightness and 600 nits minimum peak brightness	–
Response time detail
Response time detail	1ms grey to grey in Faster mode	–
Viewing angles
Viewing angles	178° horizontal and vertical, CR ≥ 10	178° horizontal, 178° vertical (CR ≥ 10)
Pixel pitch
Pixel pitch	0.1554 x 0.1554 mm	0.1776 × 0.1776 mm
Eye care
Eye care	Flicker Safe, Reader Mode and Live Color Low Blue Light with TÜV Rheinland Eyesafe certification	Reader Mode, Color Weakness mode; panel UL-verified Flicker-Free and Discomfort Glare Free, Eyesafe 3.0
Burn-in protection
Burn-in protection	–	OLED Care, including an OLED Care screen saver
Calibration
Calibration	Factory colour calibration and hardware calibration support	Factory calibrated; hardware calibration ready (LG Calibration Studio)
Connections
Video inputs
Video inputs	2 × HDMI 2.1, DisplayPort 2.1	2 × HDMI 2.1, DisplayPort 2.1 UHBR20, USB-C
USB-C charging
USB-C charging	None	Up to 90 W (better)
USB ports
USB ports	2 × USB-A	2 × USB-A
KVM switch
KVM switch	–	No
Ethernet
Ethernet	–	No
Speakers
Speakers	No	Yes
USB-C detail
USB-C detail	–	Upstream; display input (DisplayPort Alt Mode), data and up to 90 W charging over one cable
HDMI detail
HDMI detail	2 x HDMI 2.1; 3840 x 2160 at 240Hz or 1920 x 1080 at 480Hz	–
DisplayPort detail
DisplayPort detail	1 x DisplayPort 2.1; 3840 x 2160 at 240Hz or 1920 x 1080 at 480Hz	–
USB hub detail
USB hub detail	USB 3.2 Gen 1; one USB-B upstream and two USB-A downstream ports	2 × USB-A (USB 3.2 Gen 2), upstream via USB-C
Picture by picture
Picture by picture	No picture in picture or picture by picture	PBP (2 inputs), PIP
Audio out
Audio out	Four-pole headphone and microphone jack with DTS Headphone:X	4-pole headphone out (sound + mic)
Speaker detail
Speaker detail	–	2 × 7 W, AI Sound
Design
Stand adjusts
Stand adjusts	Height, tilt, swivel, pivot (better)	Height, tilt, swivel
VESA mount
VESA mount	Yes	Yes
Weight with stand
Weight with stand	9.4 kg	10.7 kg
Height adjustment
Height adjustment	110 mm	–
Tilt
Tilt	-8° to +15°	–
Swivel
Swivel	-30° to +30°	–
Pivot
Pivot	Counter-clockwise portrait rotation	–
VESA pattern
VESA pattern	100 x 100 mm	100 × 100 mm
Size with stand
Size with stand	614.7 x 249.1 x 471.8–581.8 mm (W x D x H)	921.4 × 605.4 × 322.8 mm (raised), 921.4 × 495.4 × 322.8 mm (lowered)
Size without stand
Size without stand	614.7 x 68.1 x 365.4 mm (W x D x H)	921.4 × 405.0 × 118.7 mm
Weight without stand
Weight without stand	5.2 kg	6.8 kg
Controls
Controls	Rear joystick; user-defined shortcut key	–
Colours
Colours	Black with Unity Hexagon Lighting	Black
Power and support
Power use
Power use	44 W on mode (LG Korea); ≤ 0.5 W sleep; ≤ 0.3 W off	Less than 0.5 W (sleep)
Power supply
Power supply	External adapter; 100–240V, 50/60Hz	External adapter, 100–240 V AC, 50/60 Hz
Software
Software	LG Switch, LG Calibration Studio and Dual Controller	LG Calibration Studio (True Color Pro), Dual Controller
Certifications
Certifications	–	UL-verified Perfect Black, Perfect Colour and Perfect Reproduction
In the box
In the box	Adapter, power cable, HDMI cable, DisplayPort cable and USB A to B cable	–