The LG 27G640A-B is a 27-inch Ultragear gaming monitor built around a QHD (2560 x 1440) IPS panel, offering a balance of image clarity and color consistency. The IPS technology ensures wide viewing angles and accurate reproduction of hues, making it suitable for both competitive gaming and content consumption. The display supports a 300 Hz refresh rate and a 1 ms response time (GtG), delivering smooth motion handling during fast-paced gameplay. Variable refresh rate technologies including NVIDIA G-Sync Compatible and AMD FreeSync Premium are integrated to reduce screen tearing and stuttering.

The monitor carries VESA DisplayHDR 400 certification, enabling a peak luminance of 400 cd/m² for HDR content, though HDR performance remains within the entry-to-mid tier segment. Construction quality is robust, with a matte black finish and a stand that offers tilt, height, swivel, and pivot adjustments for ergonomic comfort. The bezels are relatively thin, contributing to a modern aesthetic suitable for multi-monitor setups. Port selection includes HDMI 2.1, DisplayPort, and USB Type-C, allowing connectivity with modern consoles, PCs, and laptops.

HDMI 2.1 support is especially beneficial for high-bandwidth signals from next-generation consoles, while USB Type-C can deliver up to 65 W power delivery for compatible devices. The on-screen display menu is navigable via a joystick, providing quick access to gaming presets, crosshair overlays, and black stabilizer settings. In terms of operating stability, the monitor maintains consistent performance with low input lag and minimal ghosting due to the fast IPS panel. The 300 Hz refresh rate, combined with the 1 ms response, reduces motion blur in esports titles.

The power consumption is within typical ranges for a 27-inch QHD display, and the backlight is flicker-safe at default settings. The inclusion of a USB Type-C input adds convenience for users who switch between a desktop and a laptop. The overall durability is supported by LG’s manufacturing standards, with a sturdy stand and VESA mount compatibility (100 x 100 mm) for alternative mounting solutions.

This monitor is well-suited for gamers seeking a high frame rate experience at 1440p resolution, as well as users who require accurate color reproduction for casual creative work. The combination of fast refresh, adaptive sync, and ergonomic stand offers a versatile package. At its price point, the LG 27G640A-B delivers a compelling set of specifications without premium HDR or OLED-level contrast, but remains a strong performer in its category.