LG UltraGear 27GL850-B vs LG UltraGear OLED 34GX900A

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UltraGear 27GL850-B compared with UltraGear OLED 34GX900A

	LGUltraGear 27GL850-B	LGUltraGear OLED 34GX900A
Overview
Released
Released	July 2019	September 2025
Display
Screen size
Screen size	27″	34″
Resolution
Resolution	2560 × 1440 (QHD)	3440 × 1440 (UWQHD) (better)
Sharpness
Sharpness	109 pixels per inch	110 pixels per inch (better)
Panel
Panel	IPS (Nano IPS)	OLED (LG Display WOLED with MLA+ (TFTCentral))
Refresh rate
Refresh rate	144 Hz	240 Hz (better)
Response time (grey to grey)
Response time (grey to grey)	1 ms	0.03 ms (better)
Brightness (typical)
Brightness (typical)	350 nits (better)	275 nits
HDR peak brightness
HDR peak brightness	–	1,300 nits
HDR certification
HDR certification	–	DisplayHDR True Black 400
HDR formats
HDR formats	HDR10	HDR10
Contrast ratio
Contrast ratio	1,000:1	1,500,000:1
Colour range
Colour range	98% DCI-P3 (CIE 1976)	98.5% DCI-P3 (typical)
DCI-P3 coverage
DCI-P3 coverage	98%	98.5% (better)
Shape
Shape	Flat	Curved (800R)
Adaptive sync
Adaptive sync	G-Sync Compatible, FreeSync	FreeSync Premium Pro, G-Sync Compatible
Colour depth
Colour depth	1.07 billion colours; 8-bit plus FRC (TFTCentral)	1.07 billion colours
sRGB coverage
sRGB coverage	135% sRGB (LG Korea)	–
Colour accuracy
Colour accuracy	Factory colour calibration	–
Colour modes
Colour modes	sRGB and Reader modes; Gamer, FPS and RTS presets (TFTCentral)	Reader Mode, Colour Weakness mode
HDR detail
HDR detail	HDR10 input support; no local dimming (TFTCentral)	HDR10; VESA DisplayHDR True Black 400; 1,300 nits peak (TFTCentral, from LG)
Response time detail
Response time detail	1ms grey to grey in Faster mode; LG warns this setting can cause visible trails and recommends Fast if they occur	–
Variable refresh range
Variable refresh range	48–144Hz over DisplayPort; 48–100Hz over HDMI with adaptive sync (TFTCentral)	–
Viewing angles
Viewing angles	178° horizontal and vertical, CR ≥ 10	178° / 178°
Pixel pitch
Pixel pitch	0.2331 x 0.2331 mm	0.231 × 0.231 mm
Calibration
Calibration	–	Factory calibrated; hardware calibration ready (LG Calibration Studio)
Eye care
Eye care	Flicker Safe and Reader Mode	–
Connections
Video inputs
Video inputs	2 × HDMI 2.0, DisplayPort 1.4	2 × HDMI 2.1, DisplayPort 1.4, USB-C
USB-C charging
USB-C charging	None	Up to 65 W (better)
USB ports
USB ports	2 × USB-A	2 × USB-A
Speakers
Speakers	No	Yes
HDMI detail
HDMI detail	2 x HDMI 2.0; 2560 x 1440 at 144Hz with 8-bit colour in LG's specification; adaptive-sync operation has a lower maximum	2 × HDMI 2.1 (cable included)
DisplayPort detail
DisplayPort detail	1 x DisplayPort 1.4; 2560 x 1440 at 144Hz with 10-bit colour	DisplayPort 1.4 with DSC
USB-C detail
USB-C detail	–	USB-C with DisplayPort Alt Mode and 65 W power delivery
USB hub detail
USB hub detail	USB 3.0; one upstream and two downstream ports	2 × USB 3.0 downstream
Picture by picture
Picture by picture	–	PIP; 2-way PBP
Audio out
Audio out	Headphone output	4-pole headphone out (sound and mic)
Speaker detail
Speaker detail	–	2 × 7 W
Design
Stand adjusts
Stand adjusts	Height, tilt, pivot	Height, tilt, swivel
VESA mount
VESA mount	Yes	Yes
Weight with stand
Weight with stand	6.1 kg	10.4 kg
Height adjustment
Height adjustment	110 mm	–
VESA pattern
VESA pattern	100 x 100 mm	100 × 100 mm
Size with stand
Size with stand	614.2 x 274.4 x 464.8–574.8 mm (W x D x H)	784.1 × 291.8 × 470.4–580.4 mm (W × D × H)
Size without stand
Size without stand	614.2 x 56.3 x 364.8 mm (W x D x H)	784.1 × 167.1 × 358.3 mm (W × D × H)
Weight without stand
Weight without stand	4.2 kg	6.2 kg
Controls
Controls	–	User-defined key; auto input switch; dual controller; game features include Black Stabiliser, Dynamic Action Sync, Crosshair and FPS Counter
Colours
Colours	Black with red trim	–
Power and support
Power use
Power use	51 W on mode; 65 W maximum; ≤ 0.5 W sleep; ≤ 0.3 W off	Less than 0.5 W sleep, less than 0.3 W off
Power supply
Power supply	External adapter; 100–240V, 50/60Hz	External adapter, 100–240 V
Software
Software	OnScreen Control	–
In the box
In the box	Adapter, power cable, HDMI cable, DisplayPort cable and USB 3.0 upstream cable	HDMI 2.1 cable, USB-C cable, DisplayPort cable