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LG OLED B4 vs LG OLED GX

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

Better figure, where one is clearly better

LGOLED B4LGOLED GX
Overview
ReleasedMarch 2024April 2020
Display
PanelOLEDOLED
Panel detailSelf-lit 4K OLED with pixel dimmingSelf-lit OLED panel in LG's Gallery chassis, supplied with a flush wall mount
Resolution3840 × 2160 (4K)3840 × 2160 (4K)
Refresh rate120 Hz120 Hz
HDR formatsDolby Vision, HDR10, HLGDolby Vision, HDR10, HLG
HDR extras–Dolby Vision IQ, LG HDR10 Pro processing and Filmmaker Mode; no HDR10+ claim
Picture processingAI Picture Pro, α8 AI Super Upscaling 4K, AI Brightness Control, Dynamic Tone Mapping Pro and Filmmaker ModeAI Picture Pro, AI Upscaling, AI Brightness and HDR Dynamic Tone Mapping Pro
Picture modesPersonalised Picture Wizard, Vivid, Standard, APS, Cinema, Sports, Game, Filmmaker and ISF Expert bright/dark room modesTen modes including Filmmaker, Cinema, Game and ISF Expert bright and dark room
Motion handlingNative 120Hz panel; OLED Motion and HDMI 4K 120 fps inputOLED Motion Pro, with 4K high frame rate support; LG Switzerland's exact OLED55GX6LA specification describes a 100/120 Hz native panel
Sizes
Sizes48, 55, 65, 77″55, 65, 77″
Largest size77″77″
Gaming
HDMI ports4 (all HDMI 2.1 at 4K 120 Hz+)4 (all HDMI 2.1 at 4K 120 Hz+)
Variable refresh rateHDMI VRR, FreeSync Premium, G-Sync CompatibleHDMI VRR, FreeSync, G-Sync Compatible
Auto low latency modeYesYes
HDMI detailFour inputs support 4K 120Hz, VRR, ALLM and QMS; eARC on HDMI 3Four HDMI 2.1 inputs; 4K 120 Hz input and eARC on HDMI 2
Variable refresh rangeLG specifies 40–120Hz–
Game featuresGame Optimiser and Dashboard, HGiG, AMD FreeSync Premium, NVIDIA G-SYNC Compatible and Dolby Vision gaming at 4K 120HzHDMI VRR, ALLM, G-SYNC Compatible, FreeSync and HGiG. LG's current UK GX6LA specifications list FreeSync; launch-era review coverage described it as pending a software update.
Smart TV and sound
Smart TV platformwebOSwebOS
Processorα8 AI Processor 4Kα9 Gen3 AI Processor 4K
Speakers20 W, 2.0 channels60 W, 4.2 channels
Dolby AtmosYesYes
eARCYesYes
Wi-FiWi-Fi 5Wi-Fi 5 (802.11ac)
Bluetooth5.15.0
Speaker detailDown-firing 2.0-channel speakersDown-firing 60 W, 4.2-channel system with a 20 W woofer on all three UK size specifications
Audio featuresα8 AI Sound Pro with virtual 9.1.2 up-mixing, acoustic tuning, Clear Voice Pro, Bluetooth Surround Ready and WiSA up to 2.1 channelsAI Sound Pro, AI Acoustic Tuning, Clear Voice IV, LG Sound Sync and WiSA speaker support
Voice assistantsBuilt-in Amazon Alexa and LG intelligent voice recognition; supported languages vary by countryLG ThinQ AI, Google Assistant and Amazon Alexa built in
CastingApple AirPlay 2, ThinQ remote app and Multi ViewApple AirPlay 2 and HomeKit, Screen Share and DIAL
Software updateswebOS 24; LG states four upgrades over five years with regional scheduling differences and security support through 31 December 2028. LG Australia's March 2024 launch notice confirms the range available now and lists 55/65-inch B4 March availability; release records that first confirmed series month, not a universal UK size-specific date.webOS 5.0. LG UK's rollout table scheduled 55- and 65-inch models for the week beginning 6 April 2020 and the 77-inch for the week beginning 11 May; an exact first retail day was not verified.
TV tuners–UK DVB-T2/T, DVB-C and DVB-S2/S with two RF inputs and CI slot
USBTwo USB 2.0 portsThree side USB ports
EthernetEthernet LAN portOne LAN port
Optical audio outOne optical digital audio outputOne optical digital audio output; shared headphone and line output also listed
Design and power
SizeWithout stand (W × H × D): 48″ 1070 × 620 × 45.9 mm; 55″ 1228 × 708 × 45.9 mm; 65″ 1449 × 832 × 45.9 mm; 77″ 1719 × 989 × 50.9 mmWithout stand (W × H × D): 55-inch 1225 × 705 × 23.1 mm; 65-inch 1446 × 829 × 19.9 mm on LG UK specifications
StandWith stand (W × H × D; weight): 48″ 1070 × 684 × 235 mm, 11.7 kg; 55″ 1228 × 772 × 235 mm, 14.5 kg; 65″ 1449 × 896 × 235 mm, 17.3 kg; 77″ 1719 × 1057 × 319 mm, 23.5 kg. Stand footprint: 48″ 933 × 235 mm; 55/65″ 1057 × 235 mm; 77″ 1403 × 319 mm.Flush wall mount included; table stand is an optional purchase. LG lists TV-plus-stand weights of 22, 30.5 and 40.2 kg respectively.
VESA pattern300 × 200 mm across these UK sizes–
Power useUnder 0.5 W standby; 100–240 V AC, 50–60Hz supplyUnder 0.5 W standby on LG UK specifications
In the boxMagic Remote MR24, two AA batteries and attached power cableFlush wall mount and Magic Remote; table stand is not included

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