LG UltraGear OLED 27GX790A-B 27"

Manufacturer: LG

The LG UltraGear OLED 27GX790A-B is a 27-inch gaming monitor built around an OLED/AMOLED panel, offering a 2560 x 1440 pixel resolution at 111 ppi. With a 480Hz refresh rate, it targets demanding gaming scenarios where motion clarity and timing precision matter. The display features a matte panel with anti-glare coating, wide 178-degree viewing angles both horizontally and vertically, and support for portrait mode and height adjustment via a swivel stand with VESA mount compatibility.

On the technical side, the panel delivers a contrast ratio of 1,500,000:1 alongside a typical brightness of 275 nits and 10-bit color depth covering 1,070 million colors. Adaptive sync support spans Nvidia G-Sync, Nvidia G-Sync Compatible, and AMD FreeSync. Connectivity includes two HDMI 2.1a ports, one DisplayPort 2.1 output, three USB 3.1 ports, and a 3.5mm audio jack. Operating power consumption is rated at 48.22W, with a standby draw of 0.5W. The monitor also supports color calibration and picture-in-picture functionality.

Pros

The OLED/AMOLED panel delivers a contrast ratio of 1,500,000:1, producing deep blacks and distinct light-to-dark transitions across the screen
A 480Hz refresh rate combined with a 0.03ms response time makes this monitor well-suited for fast-paced gaming where motion clarity is critical
Adaptive sync support covers both Nvidia G-Sync and AMD FreeSync, making it compatible with a wide range of graphics hardware
The stand supports tilt, swivel, and portrait mode, offering meaningful flexibility in how the display can be physically positioned
DisplayPort 2.1 and HDMI 2.1a ports provide up to-date video input options capable of handling high bandwidth signals
The matte panel with anti-glare coating helps reduce reflections in environments with ambient lighting

Cons

At 275 nits typical brightness, the panel may struggle in very bright room conditions
The monitor carries an EU energy label of F, indicating relatively high energy consumption for its class
No USB Type-C port is available, limiting direct connection options for modern laptops and devices without adapters
There are no built-in speakers, so a separate audio solution is required for sound output
No Ethernet, Wi-Fi, or AirPlay support means the monitor cannot connect to a network independently

Who is this for?

This monitor is a strong fit for competitive and fast-paced gaming, where its 480Hz refresh rate and 0.03ms response time allow for smooth, responsive visuals with minimal motion blur. The combination of Nvidia G-Sync and AMD FreeSync support makes it a practical choice for users with either GPU brand, while the DisplayPort 2.1 and HDMI 2.1a inputs suit those running modern, high-bandwidth graphics setups. The swivel stand and portrait mode capability also make it a reasonable option for users who need flexible screen positioning or occasionally work with vertically oriented content.

Who is this NOT for?

Users who work in bright or high-ambient-light environments may find the 275 nits typical brightness limiting, as the panel may not produce sufficient visibility under strong lighting conditions. The absence of built-in speakers and USB Type-C connectivity makes this monitor less practical for those seeking a streamlined, all-in-one desk setup with minimal external peripherals. Additionally, users with strict energy efficiency requirements should note the EU energy label of F, meaning the monitor is not well-suited for setups where low power consumption is a priority.

Display:

Display type	OLED/AMOLED
response time	0.03 ms
screen size	27"
resolution	2560 x 1440 px
pixel density	111 ppi
Adaptive synchronization	Nvidia G-Sync, AMD FreeSync, Nvidia G-Sync Compatible
has anti-glare coating	✓
refresh rate	480Hz
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, with a resolution of 2560 x 1440 pixels at a pixel density of 111 ppi. Its 480Hz refresh rate is paired with an exceptionally low response time of 0.03ms, making it well-suited for fast-paced content. The panel is matte and carries an anti-glare coating, while both horizontal and vertical viewing angles reach 178 degrees. Adaptive sync support covers Nvidia G-Sync, Nvidia G-Sync Compatible, and AMD FreeSync. The screen does not have a glossy finish and does not include touch input.

General info:

Type	Gaming
EU energy label	F
supports total tilt	✓
Has a swivel stand	✓
Supports VESA mount	✓
height	351 mm
width	605.2 mm
thickness	45.3 mm
weight	9300 g
supports portrait mode	✓
volume	9622.86156 cm³

This is a gaming-type monitor with an EU energy label of F, measuring 605.2 mm wide, 351 mm tall, and 45.3 mm thick, with a total volume of 9622.86 cm³ and a weight of 9300 g. The stand supports tilt, swivel, and portrait mode, giving users a reasonable range of positioning options. VESA mount compatibility is also included for those who prefer an alternative mounting solution.

Colors:

brightness (typical)	275 nits
supports color calibration	✓
display colors	1070 million
bit depth	10-bit
contrast ratio	1500000:1

The display is capable of rendering 1,070 million colors at a 10-bit color depth, supported by a typical brightness of 275 nits and a contrast ratio of 1,500,000:1. Color calibration is also supported, allowing for adjustments to color accuracy when needed.

Connectivity:

HDMI ports	2
supports Thunderbolt	✕
DisplayPort outputs	1
DisplayPort version	DisplayPort 2.1
has a socket for a 3.5 mm audio jack	✓
has a DVI connector	✕
USB ports	3
USB version	3.1
Has USB Type-C	✕
HDMI version	HDMI 2.1a
supports Ethernet	✕
supports Wi-Fi	✕
has AirPlay	✕
mini DisplayPort outputs	0
has a VGA connector	✕

The monitor offers a wired connectivity setup built around two HDMI 2.1a ports and one DisplayPort 2.1 output, along with three USB 3.1 ports and a 3.5mm audio jack. It does not include USB Type-C, Thunderbolt, DVI, VGA, or mini DisplayPort outputs, nor does it support Ethernet, Wi-Fi, or AirPlay, keeping the connection options focused on standard display and peripheral use.

Power:

operating power consumption	48.22W
standby power consumption	0.5W

The monitor draws 48.22W during normal operation and drops to a low 0.5W in standby mode.

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, but does not feature stereo speakers, a remote control, a front camera, or an ambient light sensor. Audio-related technologies such as Dolby Digital, Dolby Digital Plus, and DTS Surround are not supported, and the monitor does not include built-in smart TV capabilities.

Final Verdict

The LG UltraGear OLED 27GX790A-B is a gaming monitor built around a clear set of priorities: speed, responsiveness, and display depth. Its 480Hz refresh rate paired with a 0.03ms response time places it firmly in the upper tier of gaming-focused displays, and the 1,500,000:1 contrast ratio of its OLED panel adds a level of visual depth that flat LCD panels cannot replicate. The connectivity suite, featuring DisplayPort 2.1 and HDMI 2.1a, ensures the hardware is well-matched to current-generation graphics equipment. Where it falls short — notably in brightness, the absence of speakers, and limited USB versatility — reflects deliberate trade-offs rather than oversights, making it best appreciated by users whose needs align tightly with competitive gaming and immersive visuals rather than a general-purpose workstation setup.