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LG 34U640B-B 34-Inch UltraWide 21:9 QHD (3440 x 1440) Curved Professional Computer Monitor, 144Hz, FreeSync Premium, HDR10, HDMI, DisplayPort, USB Type-C PD 65W, Tilt/Height Adjustable Stand, Black

LG 34U640B-B 34-Inch UltraWide 21:9 QHD (3440 x 1440) Curved Professional Computer Monitor

Bottom line: The LG 34U640B-B 34-Inch UltraWide 21:9 QHD is a specs-and-price decision rather than a crowd-consensus one in the gaming monitors category. Check the specification table above against one or two close alternatives — on price and spec fit, not on star ratings.

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Mike Perry — Hardware researcher since 2014. For gaming and productivity monitors, synthesises manufacturer specs against measured monitor reviews (RTINGS, Monitors Unboxed) rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. How we check display specs →

Before you buy

  • Check the listed dimensions, connectors and platform compatibility against your setup before ordering
  • Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

Manufacturer description

The 34U640B-B LG UltraWide monitor is built to elevate productivity, creativity, and everyday comfort. Its expansive 34" 21:9 UltraWide WQHD (3440×1440) display gives you more room to multitask across multiple windows—reducing clutter and helping you stay focused. A subtle 1800R curve and slim, virtually borderless design create a more natural, distraction-free workspace.A 144Hz refresh rate and 5ms response time keep visuals smooth and clear for video calls, streaming, and gaming. AMD FreeSync Premium reduces tearing and stutter for controlled responsive motion. With up to 99% sRGB coverage…

SpecPicks Verdict

SpecPicks scored LG 34U640B-B 34-Inch UltraWide 21:9 QHD (3440 x 1440) Curved… using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the gaming monitors category. Compare with similarly-priced alternatives in the gaming monitors category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for gaming monitors of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • Widescreen Workflows Made Effortless - Upgrade your desktop setup with a curved 34" 21:9 UltraWide WQHD display that lets you see more at once. Enjoy smooth 144Hz visuals, vibrant HDR color, and a sleek, narrow-bezel design—perfect for on-screen multitasking, creativity, and everyday comfort.
  • Curved 21:9 UltraWide WQHD Display - The 21:9 UltraWide WQHD (3440×1440) display gives you room to work across multiple apps at once—reducing window switching and improving focus. The subtle 1800R curve follows your natural line of sight for comfortable long sessions, while the sleek design keeps your workspace open, clean, and distraction-free.
  • Up to 99% sRGB Color Coverage - Up to 99% sRGB coverage and HDR10 support deliver balanced color and smooth tonal transitions across documents, media, and HDR content.
  • USB Type-C: All-in-One Connectivity - USB-C connectivity simplifies your setup by handling display, data, and up to 65W laptop charging through a single cable. With DisplayPort and HDMI and two USB ports also on board, it’s easy to connect laptops and peripherals for a cleaner desk and smoother workflows.
  • Dual Controller (KVM Switch) - Control two PCs with a single monitor, keyboard, and mouse. Easily switch between devices and move files between systems with simple drag-and-drop—streamlining your setup and reducing desk clutter without extra hardware.
  • Customize Your Screen View with the Switch App - The Switch app transforms your screen into a multitasking hub for work, gaming, and streaming. Effortlessly split the screen into up to 6 sections, customize display layouts, or launch video calls with a single hotkey.

Full Specifications

BrandLG
ColorBlack
ShapeCurved
Voltage240 volts
Brightness300 candela_per_square_meter
Model Name34U640B-B.AUS
ResolutionQHD Ultra Wide 1440p
Unit Count1 Count
Color Gamut99
Pixel Pitch0.23
Screen Size34 inches
Aspect Ratio21:9
ConnectivityUSB-C
Display TypeLED
Model Number34U640B-B.AUS
Refresh Rate144
Adaptive SyncFreeSync Premium
CompatibilitySwitch
Mounting TypeWall Mount
Response Time5 milliseconds
Full listing titleLG 34U640B-B 34-Inch UltraWide 21:9 QHD (3440 x 1440) Curved Professional Computer Monitor, 144Hz, FreeSync Premium, HDR10, HDMI, DisplayPort, USB Type-C PD 65W, Tilt/Height Adjustable Stand, Black

Ready to buy?

LG 34U640B-B 34-Inch UltraWide 21:9 QHD (3440 x 1440) Curved Professional Computer Monitor, 144Hz, FreeSync Premium, HDR10, HDMI, DisplayPort, USB Type-C PD 65W, Tilt/Height Adjustable Stand, Black is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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