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LG UltraGear OLED 45GX900A-B 45" specifications and in-depth review

LG UltraGear OLED 45GX900A-B 45"

Manufacturer: LG

The LG UltraGear OLED 45GX900A-B is a 45″ curved ultrawide monitor designed with gaming in mind, combining a high-refresh OLED panel with a wide 3440 x 1440 pixel resolution across its expansive screen. Its OLED/AMOLED display technology delivers a contrast ratio of 1,500,000:1, and the matte panel with anti-glare coating helps reduce unwanted reflections during extended sessions. The stand supports tilt, swivel, and portrait mode, and the monitor is also VESA mount compatible, offering reasonable flexibility in how it can be set up.

On the technical side, the display runs at 240Hz with a 0.03ms response time, and it supports both AMD FreeSync Premium Pro and Nvidia G-Sync Compatible adaptive sync technologies. Connectivity includes two HDMI ports, one DisplayPort 1.4 output, USB Type-C, and three additional USB 3.0 ports, along with a 3.5mm audio jack. The monitor features built-in stereo speakers rated at 2 x 7W, a 10-bit color depth, and supports color calibration, while Picture-in-Picture mode is also available for multitasking workflows.

Pros
  • The 240Hz refresh rate combined with a 0.03ms response time makes it well-suited for fast-paced gaming where motion clarity matters
  • A contrast ratio of 1,500,000:1 from the OLED panel produces a very wide difference between bright and dark areas of the image
  • The stand supports tilt, swivel, and portrait mode, and the monitor is also VESA mount compatible, offering solid ergonomic flexibility
  • Adaptive sync support for both AMD FreeSync Premium Pro and Nvidia G-Sync Compatible means it works with a broad range of graphics card setups
  • USB Type-C connectivity alongside three USB 3.0 ports and a 3.5mm audio jack provides a reasonable range of peripheral and audio options
  • Picture-in-Picture support allows two input sources to be viewed on screen at the same time
Cons
  • At 13,500g the monitor is relatively heavy, which may complicate mounting or repositioning
  • The EU energy label of F indicates comparatively high energy consumption during regular use
  • Typical brightness of only 250 nits is on the lower end for a large-format display, which may limit visibility in brightly lit environments
  • There is no Ethernet, Wi-Fi, or AirPlay support, limiting connectivity to wired video and USB inputs only
  • The built-in speakers do not support Dolby Digital, Dolby Digital Plus, or DTS Surround, keeping audio capabilities basic
Who is this for?

This monitor is a strong fit for dedicated PC gamers who prioritize fast, fluid motion in competitive or action-heavy titles, given its 240Hz refresh rate and 0.03ms response time. The support for both AMD FreeSync Premium Pro and Nvidia G-Sync Compatible adaptive sync makes it compatible with a wide range of gaming setups without restricting the user to a specific GPU brand. The 45″ ultrawide curved panel with a 3440 x 1440 resolution also suits users who enjoy immersive single-player or simulation gaming, as well as those who use their workstation for creative tasks that benefit from wide screen real estate and 10-bit color depth with color calibration support.

Who is this NOT for?

Users who need a monitor for bright, well-lit office environments may find the typical brightness of 250 nits insufficient for comfortable daytime use. The large physical footprint — 992 mm wide and weighing 13,500 g — makes it a poor choice for compact desk setups or users who frequently need to reposition or transport their display. Those looking for wireless connectivity or smart display features will find this monitor lacking, as it has no Wi-Fi, Ethernet, or AirPlay support and no built-in smart TV functionality. Additionally, users with energy efficiency requirements may be deterred by its EU energy rating of F.

Display:

Display type OLED/AMOLED
response time 0.03 ms
screen size 45"
resolution 3440 x 1440 px
pixel density 82 ppi
Adaptive synchronization AMD FreeSync Premium Pro, Nvidia G-Sync Compatible
has anti-glare coating ✓
refresh rate 240Hz
maximum horizontal viewing angle 178º
maximum vertical viewing angle 178º
has a matte panel ✓
has a glossy panel ✕
has a touch screen ✕

The display uses OLED/AMOLED technology across a 45″ curved screen with a resolution of 3440 x 1440 pixels and a pixel density of 82 ppi. It runs at a 240Hz refresh rate with an exceptionally low response time of 0.03ms, and supports both AMD FreeSync Premium Pro and Nvidia G-Sync Compatible adaptive sync for smoother motion handling. The panel is matte with an anti-glare coating, and horizontal and vertical viewing angles each reach 178 degrees, making the image remain consistent when viewed from wide positions. The screen does not have a glossy finish and does not support touch input.

General info:

Type Gaming, Curved, Ultrawide
EU energy label F
supports total tilt ✓
Has a swivel stand ✓
Supports VESA mount ✓
height 457 mm
width 992 mm
thickness 218 mm
weight 13500 g
supports portrait mode ✓
volume 98828.992 cm³

This is a gaming, curved, ultrawide monitor with physical dimensions of 992 mm wide, 457 mm tall, and 218 mm deep, with a total weight of 13,500 g. The stand supports tilt, swivel, and portrait mode, and the monitor is also VESA mount compatible, giving users flexibility in how they position or mount it. It carries an EU energy label of F, indicating its energy consumption classification under that rating system.

Colors:

brightness (typical) 250 nits
supports color calibration ✓
bit depth 10-bit
contrast ratio 1500000:1

The monitor offers a contrast ratio of 1,500,000:1 alongside a typical brightness of 250 nits. It supports a 10-bit color depth, allowing for a wider range of color gradations, and color calibration is also supported, which can be useful for users who need more precise color accuracy in their workflow.

Connectivity:

HDMI ports 2
supports Thunderbolt ✕
DisplayPort outputs 1
DisplayPort version DisplayPort 1.4
has a socket for a 3.5 mm audio jack ✓
has a DVI connector ✕
USB ports 3
USB version 3
Has USB Type-C ✓
supports Ethernet ✕
supports Wi-Fi ✕
has AirPlay ✕
mini DisplayPort outputs 0
has a VGA connector ✕

The monitor includes two HDMI ports and one DisplayPort 1.4 output, along with three USB 3.0 ports and a USB Type-C port for additional device connectivity. A 3.5mm audio jack is also present for headset use. There is no mini DisplayPort, DVI, or VGA connector, and the monitor does not support Thunderbolt, Ethernet, Wi-Fi, or AirPlay.

Power:

standby power consumption 0.5W

The only available power specification for this monitor is its standby power consumption of 0.5W, indicating the amount of power it draws when in standby mode.

Features:

has PiP ✓
has stereo speakers ✓
has built-in smart TV ✕
audio output power 2 x 7W
has a remote control ✕
supports Dolby Digital ✕
supports Dolby Digital Plus ✕
has DTS Surround ✕
has an ambient light sensor ✕
has a front camera ✕

The monitor includes built-in stereo speakers rated at 2 x 7W and supports Picture-in-Picture mode, allowing multiple sources to be displayed on screen simultaneously. It does not have a remote control, a front camera, or an ambient light sensor, and there is no built-in smart TV functionality. On the audio side, Dolby Digital, Dolby Digital Plus, and DTS Surround are not supported.

Final Verdict

The LG UltraGear OLED 45GX900A-B is a large-format gaming monitor built around a clear set of priorities: speed, immersion, and visual depth. Its 240Hz refresh rate paired with a 0.03ms response time makes it one of the more technically capable options for gamers who demand precise, fluid motion, while the OLED panel's 1,500,000:1 contrast ratio ensures a visually rich experience across its wide 45″ curved screen. Practical touches like multi-GPU adaptive sync support, flexible stand ergonomics, and a reasonable connectivity selection round out a well-specified package. That said, the lower typical brightness, high energy rating, and substantial physical size mean it is best suited to dedicated gaming environments rather than general-purpose or space-constrained setups. For users whose primary focus is immersive, high-refresh gaming on a large ultrawide display, this monitor delivers a focused and technically coherent solution.