LG 34-Inch Curved Ultrawide 144Hz Review: Specs, Pros and Cons

What stands out

• 3440x1440 WQHD resolution across a 21:9 34-inch screen
• 144Hz refresh rate with 5ms response time
• USB-C port delivering up to 65W of power
• Built-in KVM switch for dual PC control
• 99% sRGB color coverage with HDR10 support

Who it fits

LG 34U640B Key Specs Explained

Resolution: 3440×1440

This WQHD resolution provides more horizontal space than standard 16:9 monitors. You get a 21:9 aspect ratio that fits two full desktop windows side by side. This reduces the need to alt-tab between applications. The extra pixel density keeps text sharp for document editing. It offers a wider field of view for gaming without the pixelation of lower resolutions. This setup improves focus by minimizing window switching during long work sessions.

Refresh Rate: 144Hz

A 144Hz refresh rate updates the image 144 times per second. This creates smoother motion compared to standard 60Hz displays. Fast-moving scenes in games appear less blurry. Mouse movements feel more responsive and precise. This rate is ideal for competitive gaming where split-second reactions matter. It also makes scrolling through web pages or videos feel fluid. You notice the difference immediately when moving the cursor across the screen.

Sync Technology: AMD FreeSync Premium

FreeSync Premium synchronizes the monitor refresh rate with your graphics card output. This prevents screen tearing, where an image looks split horizontally. It also reduces stuttering during frame rate drops. The result is consistent, tear-free visuals during intense gaming. This technology ensures smooth gameplay without requiring a high-end GPU. It works with AMD graphics cards and compatible NVIDIA cards. This feature is essential for maintaining visual clarity during fast action.

Response Time: 5ms

A 5ms response time measures how quickly a pixel changes color. This speed reduces ghosting, the faint trail behind moving objects. It ensures that fast-paced games look clean and sharp. While not the fastest available, it is sufficient for most gamers. You will see clear motion during racing or shooter games. This spec complements the 144Hz refresh rate for a balanced experience. It helps maintain image integrity during rapid on-screen movement.

Connectivity: USB-C, DisplayPort, HDMI

USB-C allows single-cable connection for video, data, and power. It can charge laptops up to 65W through one cable. DisplayPort and HDMI provide alternative connections for desktops and consoles. Two additional USB ports help connect peripherals like keyboards. This setup simplifies desk management by reducing cable clutter. You can switch between devices easily using the KVM switch. This flexibility supports both modern laptops and traditional desktop setups.

Design and Build Overview

According to the listing, this LG monitor measures 31.9 inches wide, 18.3 inches tall, and 8.7 inches deep. It weighs 17 pounds. The color is black, and the model number is 34U640B-B.AUS. These dimensions suggest a substantial footprint on your desk. You will need adequate space for the 34-inch panel. The weight indicates a sturdy base, though you should verify your desk can support it. The narrow-bezel design keeps the workspace open and clean. This layout reduces visual distractions during long sessions. The 1800R curve follows your natural line of sight. This curvature helps maintain comfortable viewing angles without turning your head excessively. It supports extended use for work or gaming.

Connectivity is handled through a USB-C port, DisplayPort, HDMI, and two USB ports. This mix allows you to connect laptops and peripherals easily. The USB-C port supports up to 65W charging. You can simplify your setup by using a single cable for display, data, and power. The Dual Controller feature lets you manage two PCs with one keyboard and mouse. You can switch between systems and move files via drag-and-drop. This reduces desk clutter by removing the need for extra hardware. The Switch App lets you split the screen into six sections. You can customize layouts for multitasking or launch video calls with a hotkey. These features streamline your workflow and keep your desk organized.

Setup And Daily Use Guide

Setting up this monitor involves connecting it via USB-C, DisplayPort, or HDMI. The USB-C port provides up to 65W of power delivery, allowing you to charge your laptop while displaying video through a single cable. This simplifies your desk by reducing cable clutter. You also have access to two additional USB ports for peripherals. If you use multiple computers, the built-in KVM switch lets you control two PCs with one keyboard and mouse. You can switch between systems and drag and drop files without extra hardware. The monitor features an 1800R curve, which follows your natural line of sight. This design choice aims to provide comfort during long work sessions or gaming. The 21:9 aspect ratio and WQHD resolution allow you to view multiple windows side by side. You can reduce window switching by arranging your workflow across the wider screen. For further customization, the Switch app lets you split the display into up to six sections. You can customize layouts or launch video calls with a hotkey. The 144Hz refresh rate and 5ms response time ensure smooth visuals for fast motion. AMD FreeSync Premium technology helps prevent screen tearing during gameplay. The 99% sRGB color coverage ensures balanced colors for documents and media. This setup is ideal for users who want a clean desk and efficient multitasking capabilities.

Before You Buy This Monitor

You should verify that your laptop or desktop supports the 65W power delivery over USB-C if you plan to use a single-cable setup. This simplifies connections but requires compatible ports. The monitor includes a Switch app for screen splitting, so ensure your operating system supports this utility for the best multitasking experience. You will need a VESA mount if you want to adjust the viewing angle beyond the fixed stand, as the listing does not mention built-in height adjustment. Keep the screen clean with a microfiber cloth and mild cleaner, avoiding harsh chemicals that could damage the coating. This model fits well into workflows that value screen real estate over high-end gaming specs. It sits alongside other ultrawides by offering a balance of productivity features and moderate refresh rates, making it suitable for mixed use rather than competitive esports.

Check before you buy

• Check if your laptop supports 65W USB-C power delivery
• Verify operating system compatibility with the Switch app
• Confirm you have VESA mount holes if needed
• Ensure your GPU supports 3440x1440 resolution at 144Hz

The product at a glance

1

LG 34-Inch Curved Ultrawide 144Hz Monitor

Best for: multitasking and dual-PC setups

Screen Size

34-inch

Resolution

3440 x 1440

Refresh Rate

144Hz

Aspect Ratio

21:9

Response Time

5ms

Sync Technology

AMD FreeSync Premium

View on Amazon: LG 34-Inch Curved Ultrawide 144Hz Monitor Affiliate link

The LG 34U640B offers a 34-inch 21:9 WQHD display with a 144Hz refresh rate. You get a 1800R curve and 99% sRGB color coverage for comfortable viewing. USB-C connectivity provides up to 65W charging. A built-in KVM switch lets you control two PCs. This monitor suits users who want smooth motion and multitasking efficiency in a single cable setup.

Pros

• 3440x1440 resolution with 144Hz refresh rate
• 1800R curved screen for immersive viewing
• USB-C with 65W laptop charging
• Built-in KVM switch for dual PC control
• 99% sRGB color coverage

Cons

• 5ms response time may limit high-end competitive gaming
• No mention of USB-C power delivery wattage above 65W
• Curvature is modest at 1800R

Good fit if

• You need a single cable for display and laptop charging
• You want to control two computers with one keyboard and mouse
• You prefer a curved screen for multitasking

Skip if

• You require a flat panel for precise alignment
• You need a response time faster than 5ms
• You want a higher refresh rate than 144Hz

Verdict: LG 34U640B 34-inch 144Hz Ultrawide fits professionals who value clean desk setups and dual-PC workflows. It delivers smooth visuals and efficient connectivity for everyday use.

Specifications side by side

Frequently asked questions

See also

• lg 34u640b b 34 inch ultrawide wqhd alternatives
• best LG ultrawide monitors under 300
• lg ultrawide 34 inch wqhd review
• zza ultrawide 34 inch curved review