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LG UltraGear OLED 27GX704A-B 27" specifications and in-depth review

LG UltraGear OLED 27GX704A-B 27"

Manufacturer: LG

The LG UltraGear OLED 27GX704A-B is a 27-inch gaming monitor built around an OLED display panel running at 240Hz, designed for users who prioritize motion clarity and fast pixel response in their setup. It supports both AMD FreeSync Premium Pro and Nvidia G-Sync Compatible adaptive sync technologies, giving it broad compatibility across different GPU ecosystems. The stand offers tilt, swivel, height adjustment, and portrait mode rotation, along with VESA mount support for those who prefer an aftermarket arm.

The display resolves at 2560 x 1440 pixels across a 27-inch screen, yielding a pixel density of 108 ppi, with a quoted contrast ratio of 1,500,000:1 and a color output of 1.07 billion colors. Typical brightness is rated at 275 nits, and viewing angles reach 178 degrees both horizontally and vertically. On the connectivity side, the monitor includes two HDMI 2.1 ports and one DisplayPort 1.4 output, though it carries no USB hub, USB-C, or audio hardware. Operating power consumption is rated at 24W, and it holds an EU energy label of F.

Pros
  • The OLED panel delivers a contrast ratio of 1,500,000:1, producing deep blacks and highly differentiated shadow detail
  • A 240Hz refresh rate combined with a 0.03ms response time makes it well-suited for fast-paced gaming scenarios where motion clarity matters
  • Support for both AMD FreeSync Premium Pro and Nvidia G-Sync Compatible adaptive sync covers a wide range of GPU setups without requiring a specific vendor
  • The stand supports tilt, swivel, height positioning, and portrait mode rotation, offering meaningful ergonomic flexibility for different desk setups
  • VESA mount compatibility allows the display to be used with third-party monitor arms or wall mounts
  • Color calibration support gives users the ability to fine-tune display accuracy to their specific workflow or preference
Cons
  • No USB ports of any kind are included, so the monitor cannot function as a hub for peripherals
  • The panel lacks both anti-glare coating and a matte finish, which may cause reflections in brightly lit environments
  • Built-in audio is entirely absent, with no stereo speakers or support for Dolby Digital, Dolby Digital Plus, or DTS Surround
  • There is no USB-C or Thunderbolt connectivity, limiting single-cable setup options
  • Typical brightness is rated at 275 nits, which is relatively modest for a display intended for gaming use
  • The EU energy label rating of F indicates relatively higher energy consumption compared to more efficient display alternatives
Who is this for?

This monitor is well-matched for PC gamers who prioritize fast motion response and smooth frame delivery, given its 240Hz refresh rate, 0.03ms response time, and support for both AMD FreeSync Premium Pro and Nvidia G-Sync Compatible adaptive sync. The wide 178-degree viewing angles and 1,500,000:1 contrast ratio make it equally fitting for users who want strong image depth and consistent visibility across different viewing positions. Those who value ergonomic flexibility will also find it practical, as the stand accommodates tilt, swivel, portrait rotation, and VESA mounting for a range of desk configurations.

Who is this NOT for?

Users who work in brightly lit rooms or near windows may find this monitor problematic, as the panel has neither a matte finish nor an anti-glare coating, making it vulnerable to reflections and glare. It is also a poor fit for those who rely on a monitor as a USB hub or connectivity hub, since there are no USB ports, no USB-C, and no Thunderbolt support. Additionally, users who need integrated audio output — such as those without separate speakers or a dedicated sound setup — will find this monitor inadequate, as it includes no speakers and supports no audio formats whatsoever.

Display:

Display type OLED/AMOLED
response time 0.03 ms
screen size 27"
resolution 2560 x 1440 px
pixel density 108 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 section of this monitor is built around an OLED/AMOLED panel measuring 27 inches, delivering a resolution of 2560 x 1440 pixels at a pixel density of 108 ppi. It runs at a 240Hz refresh rate with an exceptionally low response time of 0.03 ms, and supports both AMD FreeSync Premium Pro and Nvidia G-Sync Compatible adaptive sync. Viewing angles reach 178 degrees horizontally and vertically, offering consistent image quality across a wide range of positions. The panel is neither matte nor glossy and does not include an anti-glare coating or touch input.

General info:

Type Gaming
EU energy label F
supports total tilt ✓
Has a swivel stand ✓
Supports VESA mount ✓
height 351 mm
width 605 mm
thickness 45 mm
weight 7200 g
supports portrait mode ✓
volume 9555.975 cm³

This is a gaming-type monitor with physical dimensions of 605 mm wide, 351 mm tall, and 45 mm thick, weighing 7,200 g. The stand supports tilt, swivel, and portrait mode rotation, offering a reasonable degree of ergonomic adjustability, and the monitor is also compatible with VESA mounting for use with third-party arms or wall brackets. It carries an EU energy label of F and has a total volume of 9,555.975 cm³.

Colors:

brightness (typical) 275 nits
supports color calibration ✓
display colors 1070 million
contrast ratio 1500000:1

The monitor outputs a color depth of 1,070 million colors alongside a contrast ratio of 1,500,000:1, reflecting the high dynamic range typical of OLED panel technology. Typical brightness is rated at 275 nits, and the display supports color calibration, allowing users to adjust color accuracy to their specific needs.

Connectivity:

HDMI ports 2
supports Thunderbolt ✕
DisplayPort outputs 1
DisplayPort version DisplayPort 1.4
has a DVI connector ✕
USB ports 0
Has USB Type-C ✕
HDMI version HDMI 2.1
supports Ethernet ✕
supports Wi-Fi ✕
has AirPlay ✕
mini DisplayPort outputs 0
has a VGA connector ✕

Connectivity on this monitor is centered around two HDMI 2.1 ports and one DisplayPort 1.4 output, covering the main video input options for modern systems. There are no USB ports of any kind, including no USB-C or Thunderbolt support, and legacy connectors such as DVI and VGA are absent. The monitor also lacks networking features entirely, with no Ethernet, Wi-Fi, or AirPlay support.

Power:

operating power consumption 24W

The monitor has an operating power consumption of 24W, which represents its rated draw during normal use.

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 ✕

This monitor does not include built-in speakers, Dolby Digital, Dolby Digital Plus, or DTS Surround, meaning audio output relies entirely on an external solution. There is no Picture-in-Picture support, remote control, ambient light sensor, or front camera, and the unit does not incorporate smart TV functionality.

Final Verdict

The LG UltraGear OLED 27GX704A-B positions itself as a focused gaming monitor built around the core demands of responsive, high-motion gameplay. Its 240Hz refresh rate paired with a 0.03ms response time and broad adaptive sync compatibility make it a technically capable choice for gamers who prioritize fluidity above all else, while the OLED panel's exceptional contrast ratio and wide viewing angles add visual depth that goes beyond raw speed. That said, the absence of USB connectivity, integrated audio, and surface glare protection narrows its appeal for users with broader setup requirements. For those whose primary need is a dedicated, fast-response gaming display with flexible ergonomic adjustment, this monitor delivers a clear and coherent feature set for that specific purpose.