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LG UltraGear OLED 39GX90SA-W 39" specifications and in-depth review

LG UltraGear OLED 39GX90SA-W 39"

Manufacturer: LG

The LG UltraGear OLED 39GX90SA-W is a 39-inch curved ultrawide monitor aimed at gaming use, combining an OLED/AMOLED panel with a wide 21:9-style format. Its 240Hz refresh rate places it firmly in the high-refresh-rate segment, and the curved design is complemented by broad 178-degree viewing angles both horizontally and vertically. The stand supports tilt and swivel adjustments, giving users some flexibility in positioning, while the matte panel with anti-glare coating helps manage reflections in varied lighting conditions.

On the technical side, the display delivers a 1,500,000:1 contrast ratio alongside a 0.03ms response time, both characteristic of OLED technology. The panel operates at 10-bit color depth with support for color calibration, and brightness is rated at 250 nits typical. Connectivity includes two HDMI ports, one DisplayPort 1.4 output, a USB Type-C port, three additional USB ports, and a legacy VGA connector. The monitor supports both Nvidia G-Sync Compatible and AMD FreeSync Premium adaptive sync technologies, and picture-in-picture (PiP) functionality is available. Standby power consumption is rated at 0.5W, and a remote control is included.

Pros
  • The OLED/AMOLED panel delivers an extremely high contrast ratio of 1,500,000:1, producing very deep blacks and vivid differentiation between light and dark areas
  • A 240Hz refresh rate combined with a 0.03ms response time makes this well-suited for fast-paced gaming scenarios
  • Adaptive sync support covers both Nvidia G-Sync Compatible and AMD FreeSync Premium, making it compatible with a wide range of GPU setups
  • The matte panel with anti-glare coating reduces reflections, which is practical in environments with ambient light sources
  • The stand supports both tilt and swivel adjustments, offering meaningful ergonomic flexibility for different seating positions
  • Picture-in-Picture (PiP) functionality allows viewing content from two sources simultaneously on a single screen
Cons
  • VESA mount is not supported, limiting the ability to use third-party monitor arms or wall mounts
  • There is no 3.5 mm audio jack, which prevents direct connection of headphones or speakers to the monitor
  • Stereo speakers are absent, meaning external audio hardware is required for sound output
  • Portrait mode is not supported, restricting orientation to landscape only
  • Wi-Fi, Ethernet, and AirPlay connectivity are all absent, keeping the monitor strictly dependent on wired video input sources
  • At 11,450 g, the monitor is relatively heavy, which may be a consideration when moving or repositioning the display
Who is this for?

This monitor is a strong fit for PC gamers who prioritize fast, responsive gameplay, as the combination of a 240Hz refresh rate, 0.03ms response time, and support for both Nvidia G-Sync Compatible and AMD FreeSync Premium addresses the core demands of competitive and immersive gaming. The 39-inch curved ultrawide format with a 3440 x 1440 resolution also suits users who value an expansive field of view for simulation, racing, or open-world titles. Additionally, the 10-bit color depth and color calibration support make it a reasonable choice for content creators or editors who work in wide-gamut color environments and need accurate, adjustable color output on a large screen.

Who is this NOT for?

Users who require flexible mounting options will find this monitor limiting, as VESA mount support is absent, making it incompatible with third-party monitor arms or wall-mounting solutions. The lack of stereo speakers, a 3.5 mm audio jack, and any wireless connectivity means it is poorly suited for users seeking a self-contained multimedia setup without additional external audio hardware. Those who work in portrait-oriented workflows, such as coders or document-heavy professionals who rely on vertical screen rotation, will also find this monitor inadequate, as portrait mode is not supported.

Display:

Display type OLED/AMOLED
response time 0.03 ms
screen size 39"
resolution 3440 x 1440 px
pixel density 95 ppi
Adaptive synchronization Nvidia G-Sync Compatible, AMD FreeSync Premium
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 an OLED/AMOLED panel measuring 39 inches with a 3440 x 1440 px resolution and a pixel density of 95 ppi. It operates at a 240Hz refresh rate and achieves a response time of 0.03ms, making it well-suited for fast-moving content. Adaptive sync is handled through both Nvidia G-Sync Compatible and AMD FreeSync Premium technologies. Viewing angles reach 178 degrees on both the horizontal and vertical axes, and the panel carries a matte finish with an anti-glare coating, while a glossy surface and touch input are not supported.

General info:

Type Gaming, Curved, Ultrawide
supports total tilt ✓
Has a swivel stand ✓
Supports VESA mount ✕
height 404 mm
width 887 mm
thickness 198 mm
weight 11450 g
supports portrait mode ✕
volume 70952.904 cm³

This is a gaming, curved, ultrawide monitor with physical dimensions of 887 mm wide, 404 mm tall, and 198 mm deep, weighing 11,450 g. The stand supports both tilt and swivel adjustments, offering a degree of ergonomic flexibility, though portrait mode orientation is not supported. VESA mounting is also not available on this model. The total volume of the unit is approximately 70,952.904 cm³.

Colors:

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

The monitor operates at a typical brightness of 250 nits and delivers a contrast ratio of 1,500,000:1, reflecting the deep black levels associated with OLED panel technology. Color output is handled at a 10-bit depth, allowing for a broad range of gradations across the color spectrum. Color calibration is supported, giving users the option to fine-tune the display's color accuracy to their specific needs.

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
Has USB Type-C ✓
supports Ethernet ✕
supports Wi-Fi ✕
has AirPlay ✕
mini DisplayPort outputs 0
has a VGA connector ✓

The monitor provides a range of video inputs, including two HDMI ports, one DisplayPort 1.4 output, and a VGA connector, while mini DisplayPort, DVI, and Thunderbolt are not available. On the USB side, there are three standard USB ports alongside a USB Type-C port. Wireless connectivity options such as Wi-Fi, Ethernet, and AirPlay are not supported. There is also no 3.5 mm audio jack on this model.

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 energy drawn when the display is in a low-power idle state.

Features:

has PiP ✓
has stereo speakers ✕
has built-in smart TV ✕
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 Picture-in-Picture (PiP) functionality and comes with a remote control for convenient operation. It does not feature stereo speakers, built-in smart TV capabilities, an ambient light sensor, or a front camera. On the audio side, Dolby Digital, Dolby Digital Plus, and DTS Surround are all absent from this model.

Final Verdict

The LG UltraGear OLED 39GX90SA-W positions itself as a dedicated gaming monitor built around the strengths of its OLED panel, and on that front it delivers in meaningful ways — the 240Hz refresh rate paired with a 0.03ms response time and a 1,500,000:1 contrast ratio form a technically coherent package for users who prioritize display responsiveness and image depth. The 39-inch curved ultrawide format adds to its appeal for immersive gaming and wide-canvas creative work, while dual adaptive sync compatibility broadens its reach across different GPU ecosystems. That said, the absence of VESA mount support, built-in audio output, and portrait mode capability means it asks users to work within a fairly defined set of conditions. For those whose needs align with what this monitor offers, it represents a well-specified option in the curved ultrawide gaming segment; for those requiring a more versatile or self-sufficient setup, its limitations are worth weighing carefully.