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LG UltraGear OLED 34GX900A vs LG UltraGear evo GX9 (39GX950B)

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

Better figure, where one is clearly better

LGUltraGear OLED 34GX900ALGUltraGear evo GX9 (39GX950B)
Overview
ReleasedSeptember 2025June 2026
Display
Screen size34″38.9″
Resolution3440 × 1440 (UWQHD)5120 × 2160 (5K2K)
Sharpness110 pixels per inch143 pixels per inch
PanelOLED (LG Display WOLED with MLA+ (TFTCentral))OLED (4th-gen Primary RGB Tandem WOLED; Dual mode: 2560 x 1080 at 330 Hz)
Refresh rate240 Hz165 Hz
Response time (grey to grey)0.03 ms0.03 ms
Brightness (typical)275 nits335 nits
HDR peak brightness1,300 nits1,500 nits
HDR certificationDisplayHDR True Black 400DisplayHDR True Black 500
HDR formatsHDR10HDR10
Contrast ratio1,500,000:11,850,000:1
Colour range98.5% DCI-P3 (typical)99.5% DCI-P3
DCI-P3 coverage98.5%99.5%
Screen finish–Matte
ShapeCurved (800R)Curved (1500R)
Adaptive syncFreeSync Premium Pro, G-Sync CompatibleG-Sync Compatible, FreeSync Premium Pro
Colour depth1.07 billion colours1.07B colours
Colour modesReader Mode, Colour Weakness mode–
HDR detailHDR10; VESA DisplayHDR True Black 400; 1,300 nits peak (TFTCentral, from LG)–
Viewing angles178° / 178°178° horizontal, 178° vertical (CR ≥ 10)
Pixel pitch0.231 × 0.231 mm0.1776 × 0.1776 mm
Eye care–Reader Mode, Color Weakness mode; panel UL-verified Flicker-Free and Discomfort Glare Free, Eyesafe 3.0
Burn-in protection–OLED Care, including an OLED Care screen saver
CalibrationFactory calibrated; hardware calibration ready (LG Calibration Studio)Factory calibrated; hardware calibration ready (LG Calibration Studio)
Connections
Video inputs2 × HDMI 2.1, DisplayPort 1.4, USB-C2 × HDMI 2.1, DisplayPort 2.1 UHBR20, USB-C
USB-C chargingUp to 65 WUp to 90 W
USB ports2 × USB-A2 × USB-A
KVM switch–No
Ethernet–No
SpeakersYesYes
HDMI detail2 × HDMI 2.1 (cable included)–
DisplayPort detailDisplayPort 1.4 with DSC–
USB-C detailUSB-C with DisplayPort Alt Mode and 65 W power deliveryUpstream; display input (DisplayPort Alt Mode), data and up to 90 W charging over one cable
USB hub detail2 × USB 3.0 downstream2 × USB-A (USB 3.2 Gen 2), upstream via USB-C
Picture by picturePIP; 2-way PBPPBP (2 inputs), PIP
Audio out4-pole headphone out (sound and mic)4-pole headphone out (sound + mic)
Speaker detail2 × 7 W2 × 7 W, AI Sound
Design
Stand adjustsHeight, tilt, swivelHeight, tilt, swivel
VESA mountYesYes
Weight with stand10.4 kg10.7 kg
VESA pattern100 × 100 mm100 × 100 mm
Size with stand784.1 × 291.8 × 470.4–580.4 mm (W × D × H)921.4 × 605.4 × 322.8 mm (raised), 921.4 × 495.4 × 322.8 mm (lowered)
Size without stand784.1 × 167.1 × 358.3 mm (W × D × H)921.4 × 405.0 × 118.7 mm
Weight without stand6.2 kg6.8 kg
Colours–Black
ControlsUser-defined key; auto input switch; dual controller; game features include Black Stabiliser, Dynamic Action Sync, Crosshair and FPS Counter–
Power and support
Power useLess than 0.5 W sleep, less than 0.3 W offLess than 0.5 W (sleep)
Power supplyExternal adapter, 100–240 VExternal adapter, 100–240 V AC, 50/60 Hz
Software–LG Calibration Studio (True Color Pro), Dual Controller
Certifications–UL-verified Perfect Black, Perfect Colour and Perfect Reproduction
In the boxHDMI 2.1 cable, USB-C cable, DisplayPort cable–

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