LG UltraGear 27G640A-B 27"

Manufacturer: LG

The LG UltraGear 27G640A-B is a 27-inch gaming monitor built around an IPS panel with a 2560x1440 resolution and a 300Hz refresh rate, making it a display clearly aimed at competitive and enthusiast PC gamers. Its glossy panel finish and wide 178-degree viewing angles both horizontally and vertically contribute to a broad, consistent image across the screen. The stand offers tilt, swivel, height adjustment, and portrait mode support, while VESA mount compatibility gives additional flexibility for custom setups.

On the connectivity side, the 27G640A-B includes two HDMI 2.1 ports alongside a DisplayPort 1.4 output, three USB ports, and a 3.5mm audio jack. Adaptive sync support covers both Nvidia G-Sync Compatible and AMD FreeSync Premium, and the panel is rated at a 1ms response time with a contrast ratio of 1300:1 and a typical brightness of 400 nits. The monitor also carries built-in stereo speakers rated at 2x5W, and its color output reaches 1.07 billion colors with factory color calibration support included.

Pros

The 300Hz refresh rate and 1ms response time make it well-suited for fast-paced gaming where smooth motion and low latency matter
Support for both Nvidia G-Sync Compatible and AMD FreeSync Premium means the adaptive sync feature works across two major GPU ecosystems
The stand supports tilt, swivel, height adjustment, and portrait mode rotation, offering solid ergonomic flexibility for a range of desk configurations
VESA mount support gives users the option to replace the stand with a third-party arm
Two HDMI 2.1 ports allow connection of multiple high-bandwidth sources simultaneously
Color calibration support and a 1.07 billion color output suggest a degree of out-of-the-box color accuracy

Cons

The glossy panel with no anti-glare coating can cause noticeable reflections in bright or mixed-lighting environments
There is no Ethernet, Wi-Fi, or AirPlay connectivity, limiting integration with networked or wireless setups
PiP functionality is absent, so users cannot view two sources on screen at the same time
No Dolby Digital, Dolby Digital Plus, or DTS Surround support restricts audio quality for users relying on the built-in 2x5W speakers
The monitor does not include a remote control, requiring all adjustments to be made directly on the unit

Who is this for?

This monitor is a strong fit for competitive and enthusiast PC gamers who prioritize fast, fluid gameplay, given its 300Hz refresh rate and 1ms response time combined with support for both Nvidia G-Sync Compatible and AMD FreeSync Premium. Users with multiple devices will appreciate having two HDMI 2.1 ports alongside a DisplayPort 1.4 output. The ergonomic stand with tilt, swivel, and portrait mode support, plus VESA compatibility, also makes it a practical choice for users who require a flexible, adjustable workspace setup.

Who is this NOT for?

Users who work in bright or mixed-lighting environments may find the glossy panel and lack of anti-glare coating a persistent source of frustration due to screen reflections. The absence of PiP support makes it unsuitable for anyone who routinely needs to monitor two video sources at once on a single display. Additionally, those looking for a monitor with wireless or networked connectivity — such as Wi-Fi, Ethernet, or AirPlay — will find this unit falls short, as none of those options are available.

Display:

Display type	LED-backlit, LCD, IPS
response time	1 ms
screen size	27"
resolution	2560 x 1440 px
pixel density	108 ppi
Adaptive synchronization	Nvidia G-Sync Compatible, AMD FreeSync Premium
has anti-glare coating	✕
refresh rate	300Hz
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 a 27-inch LED-backlit LCD IPS panel with a 2560x1440 resolution and a pixel density of 108 ppi. It reaches a 300Hz refresh rate paired with a 1ms response time, and supports both Nvidia G-Sync Compatible and AMD FreeSync Premium adaptive synchronization. The panel is glossy rather than matte and does not feature an anti-glare coating or touch input. Viewing angles extend to 178 degrees in both horizontal and vertical directions, which is typical of IPS technology.

General info:

Type	Gaming
supports total tilt	✓
Has a swivel stand	✓
Supports VESA mount	✓
height	365 mm
width	613 mm
thickness	57 mm
weight	5470 g
supports portrait mode	✓
volume	12753.465 cm³

This is a gaming-type monitor with a physical footprint of 613 mm wide, 365 mm tall, and 57 mm thick, weighing 5470 g. The stand supports tilt, swivel, and portrait mode, offering a reasonable degree of ergonomic flexibility for different desk setups. VESA mount compatibility is also included for users who prefer a third-party arm or wall mount. The unit has a total volume of 12753.465 cm³.

Colors:

brightness (typical)	400 nits
supports color calibration	✓
display colors	1070 million
contrast ratio	1300:1

The monitor offers a typical brightness of 400 nits alongside a contrast ratio of 1300:1, contributing to a reasonably defined range between light and dark areas on screen. It supports a color output of 1070 million colors, and factory color calibration is included, allowing for more accurate out-of-the-box color representation.

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
HDMI version	HDMI 2.1
supports Ethernet	✕
supports Wi-Fi	✕
has AirPlay	✕
mini DisplayPort outputs	0
has a VGA connector	✕

The monitor's connectivity options include two HDMI 2.1 ports and one DisplayPort 1.4 output, along with three USB ports and a 3.5mm headset jack. There is no DVI, VGA, mini DisplayPort, or Thunderbolt support, and the monitor does not include Ethernet, Wi-Fi, or AirPlay connectivity.

Power:

Features:

has PiP	✕
has stereo speakers	✓
has built-in smart TV	✕
audio output power	2 x 5W
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 2x5W, providing basic audio output without the need for external speakers. It does not support Dolby Digital, Dolby Digital Plus, or DTS Surround audio formats. Additional features such as PiP, a remote control, an ambient light sensor, a front camera, and built-in smart TV functionality are all absent from this model.

Final Verdict

The LG UltraGear 27G640A-B presents a well-rounded specification sheet for gamers who place a premium on display responsiveness, with its 300Hz refresh rate and 1ms response time standing out as the defining characteristics of the entire package. Dual HDMI 2.1 ports, broad adaptive sync support, and a flexible ergonomic stand round out a feature set that addresses the practical needs of a gaming-focused setup. Where it concedes ground — most notably the glossy panel in reflective environments and the absence of wireless connectivity or PiP — these are limitations that will matter more to some users than others. On balance, the 27G640A-B is a purposefully built gaming monitor whose specifications align closely with the demands of competitive and enthusiast play.

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