LG UltraFine 40U990A 40-inch Curved 5K2K Monitor

The LG UltraFine 40U990A-W.AEK is a curved 40-inch ultrawide monitor with a listed 5120 x 2160-pixel resolution and 120 Hz refresh rate. Its wide workspace, Thunderbolt 5 and claimed colour and HDR features suit demanding creative workflows, while buyers should confirm port and performance details against their particular setup.

At a glance

5120 x 2160 resolution across a 21:9 screen gives creative applications and multitasking a broad workspace.
The listing states a 120 Hz refresh rate, 5 Milliseconds response time and FreeSync Premium for gaming and fast-moving content.
Thunderbolt 5 is claimed, alongside HDMI and DisplayPort connectivity, a built-in KVM and speakers.
A curved matte panel and listed height, tilt and swivel adjustments provide options for desk positioning.

Price

£1,149.00Save 18%

Reference price: ~~£1,399.99~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

The 40-inch 21:9 format offers substantial horizontal workspace for editing timelines and multiple application windows.
The listing combines 120 Hz refresh with FreeSync Premium, making the monitor relevant to both work and gaming.
Thunderbolt 5, built-in KVM and listed USB and video connections may help consolidate a multi-device desk setup.

Technical specifications

27 specifications

Identity
Brand	LG
Model	40U990A-W.AEK

Display and video
Screen size	40 Inches
Screen technology listed	IPS
Resolution	5120 x 2160 Pixels
Resolution description	5K UHD Ultra Wide 2160p
Aspect ratio	21:9
Screen surface	Matte
Contrast ratio	2000:1
Refresh rate	120 Hz
Response time	5 Milliseconds
Brightness	450 Candela per Square Meter
Colour gamut value	99.0
Picture enhancement technologies	AMD FreeSync Premium, DisplayHDR 600, HDR10, HW Calibration Ready
Adaptive sync	FreeSync Premium

Connectivity and features
HDMI ports	2
USB ports	6
USB 3.0 ports	4
Connectivity listed	DisplayPort, Ethernet, HDMI, USB Type C
Hardware connectivity listed	DisplayPort, HDMI, Headphone, Thunderbolt, USB Type C
Product features listed	Built-in KVM, DisplayHDR 600, Thunderbolt 5, Tilt/Height/Swivel Adjustments, Ultrawide Screen
Power consumption	40 Watts

Dimensions and installation
Form factor	Curved
Mounting types listed	Desk Mount, Wall Mount
Dimensions	26D x 94.8W x 61.4H centimetres
Weight listed	14.1 Kilograms

Warranty
Warranty listed	2 Years Manufacturer Warranty

What to know before buying

Listing details to confirm

The listing is inconsistent about panel terminology, describing Nano IPS Black in the title and features while a technical field says IPS. HDR naming, FreeSync Premium versus FreeSync Premium Pro, DCI-P3 99% versus the numeric gamut field, port totals versus listed connector types, and speaker descriptions also vary. Treat these as unconfirmed listing details and check the selected model's specifications and your required connections before buying.

Who is it for?

A good fit for

Video editors, designers and other users who want a wide, high-resolution workspace.
People seeking a large curved monitor for a combination of creative work and gaming.
Laptop users considering a Thunderbolt-based desk setup, subject to confirming host compatibility and charging requirements.

Less suited to

Buyers who need confirmed port counts or a fully consistent panel, HDR and colour specification without checking the listing further.
Shoppers with limited desk space or who prefer a smaller display.

LG UltraFine 40U990A 40-inch Curved 5K2K Monitor · photo 2 — Additional product photo 2

Customer reviews on Amazon

3.9 / 5 · 4 ratings

5 stars72%72%
4 stars0%0%
3 stars0%0%
2 stars0%0%
1 star28%28%

The supplied evidence contains aggregate ratings but no customer-comment summary. The ratings are split between five-star and one-star categories, so they do not establish a clear or reliable account of satisfaction, strengths or problems. With only a small stated sample, use them cautiously and judge the monitor against the listed resolution, refresh rate and connectivity requirements.

Frequently asked questions

What resolution does the LG UltraFine 40U990A list?

The technical details give a maximum resolution of 5120 x 2160 Pixels and also describe it as 5K UHD Ultra Wide 2160p.

Is this monitor suitable for gaming?

The listing specifies 120 Hz, 5 Milliseconds response time and FreeSync Premium. Check that your computer and connection can support the resolution and refresh rate you want.

Does it include Thunderbolt 5?

Thunderbolt 5 is claimed in the title and feature details, and the listing gives two Thunderbolt ports. Confirm the exact port capabilities for your intended setup.

Can it charge a laptop over Thunderbolt?

Manufacturer copy claims 96W laptop charging over Thunderbolt 5, but the supplied technical details do not confirm this in a consistent specification table. Verify the charging capability for the exact model before relying on it.