Dell UltraSharp U4025QW 40" Curved Thunderbolt Monitor
- 40" curved 5120 x 2160, 21:9
- 120Hz, IPS Black, 2000:1 contrast
- 99% DCI-P3 and Display P3
- Thunderbolt 4, up to 140W power delivery
- 2.5GbE RJ45, KVM style multi PC control
- iMST splits into two 2560 x 2160 screens
- 3 year Dell + 2 year extended protection
Last refreshed Sep 23, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A huge, sharp ultrawide hub monitor that powers and networks a laptop over one cable, aimed at Mac and Windows professionals. Response time is office grade, so fast gamers will want a dedicated gaming display.
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ASIN: B0FPM26CRRModel: U4025QWCategory: Computer Monitors
Overview
Plugging in one Thunderbolt cable is all it takes to charge a laptop, carry video and connect Ethernet and USB through this Dell UltraSharp. The curved ultrawide panel can split into two virtual monitors, and an ambient light sensor tunes brightness.
One cable desk setups with huge, accurate screen space suit creative and multitasking work. It is a productivity screen, not built for fast gaming.
Who it's for
Designers, developers and analysts on Mac or Windows get wide color and huge workspace. Gamers chasing speed should look at gaming monitors.
Pros and cons
- One cable laptop dock
- High laptop charging power
- Wide P3 color
- Built-in 2.5GbE Ethernet
- Office grade response time
- Large desk footprint
- Only one HDMI port
Performance notes
IPS Black technology deepens blacks over standard IPS, which helps contrast in dark scenes. Thunderbolt carries video, data and charging on one cable. iMST tells the computer it has two monitors so windows snap to each half.
Where it stands among computer monitors
- #5 most-searched brand and model of the 102 computer monitors lines we track (by search demand, not sales).
From the specs of the 159 computer monitors we list; not a test result.
Specifications
| Brand | Dell |
|---|---|
| Model | U4025QW |
| Dimensions & fit | |
| Screen size | 40 inches, curvedhigher than 94% of 128 computer monitors |
| Item weight | 26.9 poundshigher than 89% of 88 computer monitors |
| Power & efficiency | |
| Power Consumption | 39.5 wattshigher than 61% of 62 computer monitors |
| Construction & materials | |
| Color Gamut | 99% DCI-P3, Display P3 |
| Compatibility & installation | |
| Connectivity | Thunderbolt 4 (140W), HDMI, DisplayPort, USB-C, USB-A, RJ45 2.5GbE |
| Included components | |
| Included Components | Monitor, stand riser, stand base, factory calibration report, setup guide |
| Warranty & support | |
| Warranty Description | Dell 3 year limited plus 2 year CPS protection |
| Other details | |
| Native Resolution | 5120 x 2160 |
| Refresh Rate | 120 Hzlower than 60% of 106 computer monitors |
| Response Time | 8 mshigher than 92% of 101 computer monitors |
| Brightness | 450 nitshigher than 86% of 51 computer monitors |
| Display Technology | IPS Black |
| Aspect Ratio | 21:9 |
| Adaptive Sync | FreeSync, G-Sync compatible |
| Contrast Ratio | 2000:1 |
| Total USB ports | 8higher than 94% of 34 computer monitors |
Closest rivals on specs
Samsung ViewFinity S7 S70D 37" 4K Monitor- Item weight 26.9 vs 17.9 pounds (+50%)
Samsung ViewFinity S5 S55GH 34" Ultrawide Monitor- Screen size 40 vs 34 inches (+18%)
Alienware AW2725DM WQHD Gaming Monitor 27 Inch- Refresh Rate 120 vs 180 Hz (-33%)
- Response Time 8 vs 1 ms (+700%)
- Brightness 450 vs 400 nits (+13%)
Frequently asked questions
Will the Dell U4025QW charge a MacBook Pro?
It supplies up to 140W over Thunderbolt 4. Dell says it is tested with macOS devices, though some features may not be supported.
Can the Dell U4025QW act as two monitors?
Yes. iMST partitions it into two 2560 x 2160 displays without extra software.
Does the Dell U4025QW have Ethernet?
Yes. A built-in RJ45 port supports up to 2.5GbE.