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LG UltraGear 27G850A-B vs LG UltraGear OLED 34GX900A

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

Better figure, where one is clearly better

LGUltraGear 27G850A-BLGUltraGear OLED 34GX900A
Overview
ReleasedFebruary 2025September 2025
Display
Screen size27″34″
Resolution3840 × 2160 (4K)3440 × 1440 (UWQHD)
Sharpness163 pixels per inch110 pixels per inch
PanelIPS (Nano IPS Black; dual mode switches to 1920 x 1080 at 480Hz)OLED (LG Display WOLED with MLA+ (TFTCentral))
Refresh rate240 Hz240 Hz
Response time (grey to grey)1 ms0.03 ms
Brightness (typical)450 nits275 nits
HDR peak brightness–1,300 nits
HDR certificationDisplayHDR 600DisplayHDR True Black 400
HDR formatsHDR10HDR10
Contrast ratio2,000:11,500,000:1
Colour range99% DCI-P3 (CIE 1976)98.5% DCI-P3 (typical)
DCI-P3 coverage99%98.5%
ShapeFlatCurved (800R)
Adaptive syncG-Sync Compatible, FreeSync Premium Pro, VESA AdaptiveSyncFreeSync Premium Pro, G-Sync Compatible
Colour depth1.07 billion colours; 8-bit plus FRC (PCW and DisplayNinja)1.07 billion colours
Colour modes–Reader Mode, Colour Weakness mode
HDR detailEight dimming zones (PCW and DisplayNinja); LG Korea lists 750 nits typical peak brightness and 600 nits minimum peak brightnessHDR10; VESA DisplayHDR True Black 400; 1,300 nits peak (TFTCentral, from LG)
Response time detail1ms grey to grey in Faster mode–
Viewing angles178° horizontal and vertical, CR ≥ 10178° / 178°
Pixel pitch0.1554 x 0.1554 mm0.231 × 0.231 mm
Eye careFlicker Safe, Reader Mode and Live Color Low Blue Light with TÜV Rheinland Eyesafe certification–
CalibrationFactory colour calibration and hardware calibration supportFactory calibrated; hardware calibration ready (LG Calibration Studio)
Connections
Video inputs2 × HDMI 2.1, DisplayPort 2.12 × HDMI 2.1, DisplayPort 1.4, USB-C
USB-C chargingNoneUp to 65 W
USB ports2 × USB-A2 × USB-A
SpeakersNoYes
HDMI detail2 x HDMI 2.1; 3840 x 2160 at 240Hz or 1920 x 1080 at 480Hz2 × HDMI 2.1 (cable included)
DisplayPort detail1 x DisplayPort 2.1; 3840 x 2160 at 240Hz or 1920 x 1080 at 480HzDisplayPort 1.4 with DSC
USB-C detail–USB-C with DisplayPort Alt Mode and 65 W power delivery
USB hub detailUSB 3.2 Gen 1; one USB-B upstream and two USB-A downstream ports2 × USB 3.0 downstream
Picture by pictureNo picture in picture or picture by picturePIP; 2-way PBP
Audio outFour-pole headphone and microphone jack with DTS Headphone:X4-pole headphone out (sound and mic)
Speaker detail–2 × 7 W
Design
Stand adjustsHeight, tilt, swivel, pivotHeight, tilt, swivel
VESA mountYesYes
Weight with stand9.4 kg10.4 kg
Height adjustment110 mm–
Tilt-8° to +15°–
Swivel-30° to +30°–
PivotCounter-clockwise portrait rotation–
VESA pattern100 x 100 mm100 × 100 mm
Size with stand614.7 x 249.1 x 471.8–581.8 mm (W x D x H)784.1 × 291.8 × 470.4–580.4 mm (W × D × H)
Size without stand614.7 x 68.1 x 365.4 mm (W x D x H)784.1 × 167.1 × 358.3 mm (W × D × H)
Weight without stand5.2 kg6.2 kg
ControlsRear joystick; user-defined shortcut keyUser-defined key; auto input switch; dual controller; game features include Black Stabiliser, Dynamic Action Sync, Crosshair and FPS Counter
ColoursBlack with Unity Hexagon Lighting–
Power and support
Power use44 W on mode (LG Korea); ≤ 0.5 W sleep; ≤ 0.3 W offLess than 0.5 W sleep, less than 0.3 W off
Power supplyExternal adapter; 100–240V, 50/60HzExternal adapter, 100–240 V
SoftwareLG Switch, LG Calibration Studio and Dual Controller–
In the boxAdapter, power cable, HDMI cable, DisplayPort cable and USB A to B cableHDMI 2.1 cable, USB-C cable, DisplayPort cable

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