This article covers LG 27G640A-B 27インチ ウルトラギア QHD (2560 x 1440) IPS ゲーミングモニター 300Hz 1ms NVIDIA G-Sync AMD FreeSync Premium VESA DisplayHDR 400 HDMI 2.1 USB Type-C チルト.

Overview

The LG 27G640A-B is a 27-inch QHD (2560×1440) IPS gaming monitor from the UltraGear lineup, boasting a 300Hz refresh rate and 1ms (GtG) response time. It delivers buttery-smooth motion for competitive shooters and fast-paced action games, while covering 95% of DCI-P3 and supporting VESA DisplayHDR 400 for vibrant colors and decent HDR performance. Connectivity is future-proof with dual HDMI 2.1 ports, DisplayPort 1.4, and a USB-C port that supports DisplayPort Alt Mode and 15W power delivery. The stand offers full ergonomic adjustments—tilt, height, swivel, and pivot—making it easy to find a comfortable viewing angle for long sessions.

Connectivity & Compatibility

Video inputs include two HDMI 2.1 (48Gbps), one DisplayPort 1.4, and one USB-C (DP Alt Mode, 15W PD). HDMI 2.1 enables 4K 120Hz output on PS5 and Xbox Series X, while FreeSync Premium and G-Sync Compatible certification ensure tear-free gameplay on both PC and consoles. The USB-C port can drive the monitor and charge a connected laptop at 15W, simplifying cable management.

Product Info

Released in 2026, the LG 27G640A-B is priced around ¥81,881 on Japan. It comes with a standard one-year manufacturer warranty, power cable, HDMI cable, stand base, and quick setup guide. Market positioning sits in the upper-mid range of high-refresh-rate gaming monitors—offering 300Hz, QHD resolution, IPS panel, and HDMI 2.1 at a sub-¥100k price point, delivering strong value for its feature set.

Best Use Cases

Competitive FPS gamers: The 300Hz refresh rate and 1ms response give a clear edge in fast-twitch titles like Valorant, CS2, and Apex Legends. Every frame counts, and this monitor keeps up. Console gamers: Dual HDMI 2.1 ports let you connect both PS5 and Xbox Series X simultaneously, each running at 120Hz. No need to swap cables—just switch inputs. * Creative professionals who also game: The IPS panel with 95% DCI-P3 coverage handles photo editing and video work reasonably well, while the high refresh rate satisfies gaming needs in one monitor. If you're on a tight budget or prioritize 4K resolution, consider other options. Also note the USB-C power delivery is limited to 15W—enough for trickle charging but not for powering a high-performance laptop under load.

Product Disclosure (Amazon)

  • Manufacturer: ウエスタンデジタル(Western Digital)
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B0CKLCFR1Q
  • Note: This article covers a manufacturer-made product based on Amazon listing details.