UltraSharp 40 Curved Thunderbolt Hub (U4025QW)

Released January 2024

Dell's 39.7-inch curved 5120 x 2160 (5K2K) IPS Black monitor at 120Hz, with a Thunderbolt 4 hub, 140W charging, 2.5GbE Ethernet and speakers, for people who want the space of two 27-inch 4K-class screens in one.

Size: 39.7″
Resolution: 5120 × 2160
PPI: 140
Panel: IPS
Refresh: 120 Hz
Brightness: 450 nits
HDR: 600
USB-C power: 140 W

What reviewers say

Reviewers agree the large 5K2K ultrawide is very sharp and accurate, with a 120Hz refresh and extensive connectivity including Thunderbolt, a KVM switch and 140W charging. The common complaint is the high price; PCWorld found contrast and HDR well short of OLED and the stand wobbly, and RTINGS found it hard to see in very bright rooms.

From pcworld.com, techradar.com and rtings.com

Specifications

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Display

Screen size: 39.7″
Resolution: 5120 × 2160 (5K2K)
Sharpness: 140 pixels per inch
Panel: IPS (IPS Black)
Refresh rate: 120 Hz
Response time (grey to grey): 5 ms
Brightness (typical): 450 nits
HDR peak brightness: 600 nits
HDR certification: DisplayHDR 600
Contrast ratio: 2,000:1
Colour range: 99% DCI-P3, 99% Display P3, 100% sRGB
DCI-P3 coverage: 99%
Colour accuracy (Delta E): Below 2
Screen finish: Matte
Shape: Curved (2500R)
Adaptive sync: HDMI VRR
Colour depth: 1.07 billion colours (8-bit + A-FRC)
sRGB coverage: 100%
Colour accuracy: Delta E < 2 (average) (DCI-P3, Display P3, sRGB, BT.709); factory calibration report in the box
HDR detail: 600 cd/m² HDR peak; HDR static metadata over HDMI
Response time detail: 5 ms (Fast), 8 ms (Normal)
Variable refresh range: 48–120 Hz (vertical scan range)
Viewing angles: 178° horizontal, 178° vertical (typical)
Pixel pitch: 0.1815 mm x 0.1815 mm
Eye care: ComfortView Plus hardware low blue light; TÜV Rheinland Eye Comfort 3.0 (5 star); ambient light sensor; flicker-free

Connections

Video inputs: HDMI 2.1, DisplayPort 1.4, Thunderbolt 4
USB-C charging: Up to 140 W
USB ports: 2 × USB-C, 5 × USB-A, Thunderbolt 4
KVM switch: Yes
Ethernet: Yes
Speakers: Yes
HDMI detail: 1 x HDMI, up to 5120 x 2160 at 120 Hz FRL with HDR static metadata and VRR as specified in HDMI 2.1
DisplayPort detail: 1 x DisplayPort 1.4 (HDCP 2.3), up to 5120 x 2160 at 120 Hz with HDR and DSC; internal MST (Screen Partition) over DisplayPort and Thunderbolt 4
USB-C detail: Thunderbolt 4 upstream (DisplayPort 1.4 Alt Mode, USB 10Gbps, Power Delivery up to 140 W EPR); USB-C 10Gbps upstream (data only); 2 x USB-C 10Gbps downstream quick-access ports (15 W)
Daisy chaining: Thunderbolt 4 downstream port (video and data, 15 W)
USB hub detail: 4 x USB-A 10Gbps rear; quick access ports with 1 x USB-A 10Gbps (BC 1.2) and 2 x USB-C 10Gbps (15 W)
Picture by picture: Picture by Picture and Picture in Picture, with KVM switching
Audio out: 3.5 mm audio line out
Speaker detail: 2 x 9 W

Design

Stand adjusts: Height, tilt, swivel
VESA mount: Yes
Weight with stand: 12.22 kg
Height adjustment: 150 mm
Tilt: -5° to 21°
Swivel: -30° to 30°
VESA pattern: 100 x 100 mm
Size with stand: 946.62 x 252.80 x 472.32–622.32 mm (W x D x H)
Size without stand: 946.62 x 108.04 x 419.14 mm (W x D x H)
Weight without stand: 8.35 kg

Power and support

Power use: 39.5 W on mode, 0.4 W standby, 1.8 W networked standby, 0.3 W off, 380 W maximum
Energy class: F
Power supply: 100–240 VAC, 50/60 Hz, 4.2 A (typical)
Software: Dell Display and Peripheral Manager (Easy Arrange)
Certifications: ENERGY STAR, TCO Certified Edge, TÜV Rheinland Eye Comfort 3.0 (5 star)
Warranty: 3 years limited hardware (UK)
In the box: Stand, power cable, DisplayPort 1.4 cable (1.8 m), HDMI 2.1 cable (1.8 m), Thunderbolt 4 active cable (1.5 m), USB-A to USB-C cable (1 m), factory calibration report

Pros and cons

Pros

5120 x 2160 on 39.7 inches gives 140 ppi, and it can be split into two 2560 x 2160 screens over one cable (internal MST)
Thunderbolt 4 hub with 140W charging, daisy chaining, KVM and 2.5GbE Ethernet
IPS Black panel with 2000:1 contrast, 99% DCI-P3, VESA DisplayHDR 600 and 2 x 9W speakers

Cons

Large and heavy at 12.22 kg with the stand
Stand adjusts for height, tilt and swivel only; no pivot
8-bit + FRC panel; HDR 600 uses edge-lit backlight dimming

Closest rivals

Model	Size	Resolution	PPI	Panel	Refresh	Brightness	HDR	USB-C power	Released
SamsungOdyssey G7 G75F (37″)	37″	3840 × 2160	119	VA	165 Hz	350 nits	600	–	Sept 2025
LGUltraGear evo GX9 (39GX950B)	38.9″	5120 × 2160	143	OLED	165 Hz	335 nits	True Black 500	90 W	Jun 2026
SamsungViewFinity S8 S80UD (37″)	37″	3840 × 2160	119	VA	60 Hz	350 nits	–	90 W	Mar 2025

Sources

Photo: i.dell.com

right-facing U4025QW Ultrasharp 40-inch Monitor: i.dell.com/is/image/DellContent//content/dam/ss2/product-images/dell-client-pro…
forward-facing Dell u4025qw Monitor: i.dell.com/is/image/DellContent//content/dam/ss2/product-images/page/category/m…
rear-facing U4025QW Ultrasharp 40-inch Monitor: i.dell.com/is/image/DellContent//content/dam/ss2/product-images/dell-client-pro…
right-profile U4025QW Ultrasharp 40-inch Monitor: i.dell.com/is/image/DellContent//content/dam/ss2/product-images/dell-client-pro…
left-profile U4025QW Ultrasharp 40-inch Monitor: i.dell.com/is/image/DellContent//content/dam/ss2/product-images/dell-client-pro…
underside U4025QW Ultrasharp 40-inch Monitor: i.dell.com/is/image/DellContent//content/dam/ss2/product-images/dell-client-pro…
Dell UltraSharp U4025QW, rear connection-panel close-up with attached cables.: Dell official UltraSharp U4025QW product-page detail image; complete supplied framing and background retained.

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