UltraSharp 52 Thunderbolt Hub (U5226KW)

Released January 2026

Dell's 51.5-inch curved 6K (6144 x 2560) IPS Black ultrawide with a 120Hz refresh rate, a Thunderbolt 4 hub with up to 140W charging, 2.5GbE Ethernet and a KVM for up to four PCs, meant to replace a multi-monitor desk.

Size: 51.5″
Resolution: 6144 × 2560
PPI: 129
Panel: IPS
Refresh: 120 Hz
Brightness: 400 nits
HDR: –
USB-C power: 140 W

What reviewers say

Reviewers agree the huge, sharp 6K screen can replace a multi-monitor setup, and praise its wide range of ports, KVM switch and picture-by-picture modes. TFTCentral found response times slow, gaming features few and HDR missing; RTINGS found reflections distracting in bright rooms and the stand's range limited, and TechRadar noted the price and the big desk it needs.

From tftcentral.co.uk, techradar.com and rtings.com

Specifications

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Display

Screen size: 51.5″
Resolution: 6144 × 2560
Sharpness: 129 pixels per inch
Panel: IPS (IPS Black)
Refresh rate: 120 Hz
Response time (grey to grey): 5 ms
Brightness (typical): 400 nits
Contrast ratio: 2,000:1
Colour range: 99% DCI-P3, 99% Display P3, 100% BT.709
DCI-P3 coverage: 99%
Colour accuracy (Delta E): Below 1.5
Screen finish: Matte
Shape: Curved (4200R)
Adaptive sync: HDMI VRR
Colour depth: 1.07 billion colours (8-bit + FRC)
sRGB coverage: 100% (CIE 1931)
Colour accuracy: Delta E < 1.5 (average) (sRGB, BT.709, DCI-P3, Display P3)
Colour modes: Standard, Movie, Game, Color Temp. (5,000K to 10,000K), Color Space (sRGB, BT.709, DCI-P3, Display P3), Custom Color
Response time detail: 5 ms GTG (Fast mode), 8 ms GTG (Normal mode)
Viewing angles: 178° horizontal, 178° vertical (typical)
Pixel pitch: 0.19644 mm x 0.19644 mm
Eye care: ComfortView Plus (blue light ≤20%), TÜV Rheinland Eye Comfort 3.0 5-star, flicker-free, ambient light sensor with Auto Brightness and Auto Color Temp.

Connections

Video inputs: 2 × HDMI 2.1, 2 × DisplayPort 1.4, Thunderbolt 4
USB-C charging: Up to 140 W
USB ports: 2 × USB-C, 5 × USB-A
KVM switch: Yes
Ethernet: Yes
Speakers: Yes
HDMI detail: 2 x HDMI (HDCP 2.2), up to 6144 x 2560 at 120 Hz FRL with VRR as specified in HDMI 2.1; no ARC/eARC or ALLM
DisplayPort detail: 2 x DisplayPort 1.4 in (HDCP 2.2), up to 6144 x 2560 at 120 Hz with DSC
USB-C detail: Thunderbolt 4 upstream (40Gbps, DisplayPort 1.4 with DSC, Power Delivery up to 140 W EPR); 3 x USB-C 10Gbps upstream (data only); 2 x USB-C 10Gbps downstream with 27 W charging
USB hub detail: 4 x USB-A 10Gbps (rear); pop-out quick access module with 2 x USB-C 10Gbps (27 W) and 1 x USB-A 10Gbps with BC1.2 charging
Picture by picture: Picture by Picture with Screen Partition (internal MST) and Picture in Picture; USB KVM for up to four PCs, Auto KVM
Speaker detail: 2 x 9 W

Design

Stand adjusts: Height, tilt, swivel
VESA mount: Yes
Weight with stand: 18.23 kg
Height adjustment: 90 mm
Tilt: -5° to 10°
Swivel: -20° to 20°
Pivot: No pivot; slant -2° to 2°
VESA pattern: 100 x 100 mm, 200 x 100 mm, 200 x 200 mm
Size with stand: 1223.32 x 255 x 576.79–666.79 mm (W x D x H)
Size without stand: 1223.32 x 111.94 x 529.05 mm (W x D x H)
Weight without stand: 12.95 kg
Controls: Joystick; power and OSD button lock
Colours: Platinum Silver

Power and support

Power use: 63.6 W on mode, 0.5 W standby, 2.0 W networked standby, 0.3 W off, 430 W maximum
Energy class: G
Power supply: 100–240 VAC, 50/60 Hz, 5.5 A (maximum)
Software: Dell Display and Peripheral Manager (Easy Arrange, KVM), Dell Color Management, Dell Device Management Console
Certifications: ENERGY STAR 8.0, EPEAT Gold with Climate+, TCO Certified 10.0 and TCO Certified Edge, TÜV Rheinland Eye Comfort 3.0 (5 star)
Warranty: 3 years with Advanced Exchange Service and Premium Panel Exchange (UK)
In the box: Stand (not with the WOST version), power cable, DisplayPort 1.4 cable (1.8 m), HDMI 2.1 cable (1.8 m), USB-C to USB-A 10Gbps cable (1 m), Thunderbolt 4 40Gbps cable (2 m)

Options

Option
With stand
Without stand (VESA mount)

Pros and cons

Pros

6144 x 2560 at 120Hz on a 4200R curved IPS Black panel with 2,000:1 contrast and 99% DCI-P3
Thunderbolt 4 with up to 140W charging, 2.5GbE Ethernet, and a KVM and Picture-by-Picture for up to four PCs
Two HDMI 2.1 and two DisplayPort 1.4 inputs, plus a pop-out module with two 27W USB-C ports and a USB-A port

Cons

Dell lists no HDR support
The stand doesn't pivot, and the monitor weighs 18.23 kg with it
The full 140W charging needs a laptop that supports USB PD EPR (Extended Power Range)

Closest rivals

Model	Size	Resolution	PPI	Panel	Refresh	Brightness	HDR	USB-C power	Released
SamsungOdyssey G9 (G91F)	49″	5120 × 1440	109	VA	144 Hz	350 nits	600	–	Apr 2025
SamsungOdyssey Neo G9 G95NC	57″	7680 × 2160	140	VA	240 Hz	420 nits	1000	–	2023
SamsungOdyssey OLED G9 G95SC	49″	5120 × 1440	109	QD-OLED	240 Hz	250 nits	True Black 400	–	Jun 2023

Sources

Photo: i.dell.com

forward-facing Dell UltraSharp 52 Thunderbolt Hub Monitor U5226KW.: i.dell.com/is/image/DellContent/content/dam/ss2/product-images/dell-client-prod…
underside Dell UltraSharp 52 Thunderbolt Hub Monitor U5226KW.: i.dell.com/is/image/DellContent/content/dam/ss2/product-images/dell-client-prod…
left-profile Dell UltraSharp 52 Thunderbolt Hub Monitor U5226KW.: i.dell.com/is/image/DellContent/content/dam/ss2/product-images/dell-client-prod…
right-profile Dell UltraSharp 52 Thunderbolt Hub Monitor U5226KW.: i.dell.com/is/image/DellContent/content/dam/ss2/product-images/dell-client-prod…
U5226KW, quick-access USB ports, close-up: i.dell.com/is/image/DellContent/content/dam/ss2/product-images/dell-client-prod…

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