Dell S3425DW Review

The S3425DW is our best ultrawide pick for a specific reason: it replaces a dual-monitor setup with one continuous screen at a genuinely accessible price. This review looks honestly at where that replacement works, and where a hands-on reviewer found a real practical limitation that Dell’s own spec sheet does not fully convey.

Quick verdict: Buy this if you want a single continuous screen instead of two monitors, at a genuinely accessible price. Check the stand’s actual height range against your desk before buying, or plan to mount it — at least one independent hands-on review found the built-in stand does not go high enough for a comfortable seated position without extra help.

A note on how this review was built: we have not tested this monitor hands-on. Every specification below is verified directly against Dell’s official documentation, cross-checked with independent hands-on testing where Dell’s own marketing does not tell the full story. We will update this page once a unit has been through our process. See our Methodology.

Key specifications

Build quality

Slim 0.33-inch side bezels, which matter more on an ultrawide than a standard monitor since they minimise the visual break when tiling windows near the screen edge. The base includes recycled aluminium in the stand, and quick-access ports at the front (one HDMI, one USB-A) make it easy to plug in a peripheral or cable temporarily without reaching around the back — a genuinely useful detail on a monitor this wide.

Display quality

A VA panel rather than IPS — see our monitor guide for the trade-off this represents: deeper 3000:1 contrast than a standard IPS panel, at the cost of colour and brightness shifting somewhat if you are not viewing roughly head-on. For a single-user ultrawide where you are almost always centred on the screen, this is a reasonable trade to make. Colour gamut is a genuinely strong 95% DCI-P3 and 99% sRGB — close to the U3225QE’s figures despite the far lower price — though Dell does not publish a Delta E accuracy figure for this model, so we cannot state a precise colour-accuracy number the way we can for the U3225QE.

Connectivity

The full verified port list: two HDMI 2.1 ports (supporting the full 3440×1440 at 120Hz), one USB-C upstream port with DisplayPort 1.4 Alternate Mode and up to 65W power delivery, one USB-C downstream port (15W), and two USB-A downstream ports, one with battery-charging support. Built-in speakers rated at 2x5W are a genuine differentiator — neither the Dell SE2725HM nor the Dell UltraSharp U3225QE in this same lineup has any audio output at all.

Worth being precise about: there is no dedicated DisplayPort connector on this monitor. Video over USB-C uses DisplayPort 1.4 Alternate Mode through the USB-C port itself, not a separate DP input. For most modern USB-C laptops this makes no practical difference, but if your setup specifically requires a native DisplayPort connection, this monitor does not have one — only HDMI and USB-C/DP Alt Mode.

The single USB-C cable carries video, data and up to 65W of charging power together — enough for most ultrabooks, though notably less than the U3225QE’s 140W Thunderbolt delivery, which matters if your laptop draws more power under load than 65W provides.

Ergonomics

Dell’s own specification lists tilt (5° to 21°), slant (4°/4° side-to-side levelling, not rotational swivel), and height adjustment as standard on this stand — no swivel or pivot is listed at all, which is worth noting plainly since it is easy to assume an ultrawide this size includes fuller adjustment.

A genuine discrepancy worth stating directly, per our own editorial standard: Dell’s spec sheet confirms height adjustment exists, but at least one independent hands-on reviewer found the stand’s height range insufficient in practice — not tall enough to comfortably position the screen at eye level for some seated setups, and specifically too low to fit a laptop or portable monitor underneath it, which the reviewer had to solve by propping the stand on a separate block. Dell’s checkbox spec (“height adjustment: yes”) and this real-world finding are not necessarily contradictory — the range exists, it may simply be narrower than some buyers expect from a premium ultrawide. If your desk or chair sits unusually high, checking Dell’s exact height range figure against your setup before buying is worth the extra step. If a monitor arm would solve this for you, confirm VESA mount compatibility for this specific model directly with Dell before assuming it — we have not independently verified that spec for this monitor.

Workspace compatibility

At 34 inches, this needs meaningfully more desk width than a standard monitor — measure your desk before buying, not just the space directly in front of your chair, since the curve means the ends sit slightly forward of a flat panel’s footprint. A curved ultrawide becomes impractical on a genuinely shallow desk, where you would sit too close to view the far edges without noticeable distortion; this suits a standard-to-deep desk far better than a compact one. Cable management benefits from the front-facing quick-access ports mentioned above, reducing how often you need to reach behind a wide panel.

Ultrawide workflow

Can this realistically replace dual monitors? For most workflows, yes. Spreadsheets, coding with a reference document open alongside, multiple browser windows tiled side by side, and general research all benefit from the extra horizontal space without a bezel gap interrupting your eye line — genuinely the main advantage an ultrawide has over two separate screens.

Where it falls short: video conferencing is one specific case where two physically separate screens can still be preferable — angling a second monitor toward a webcam position is not possible on one continuous curved panel the way it is with two independent stands. Project management tools with many small panels can also feel cramped vertically, since an ultrawide adds width, not height — if your work is vertically dense rather than horizontally spread, this shape does not solve that problem. Independent testing broadly summarises this monitor as strong for general productivity work specifically, with gaming and creative colour work handled adequately but not as a specialist strength in either direction — a genuine jack-of-all-trades positioning rather than a weakness.

Eye comfort

Dell markets a Low Blue Light and Eye Comfort feature here, as with the other monitors in this cluster. As stated in our Dell SE2725HM and U3225QE reviews, the evidence for blue-light filtering reducing eye strain remains weak generally — a Cochrane review found no meaningful benefit. The anti-glare 3H-hardness coating and 300 cd/m² brightness matched to a well-lit room are more directly useful for the factors with actual evidence behind them: glare and brightness mismatch.

Everyday productivity

For office work, finance, admin and general remote or hybrid use, the extra horizontal space genuinely reduces window-switching compared to a single standard monitor, and the built-in speakers mean video calls do not require a separate audio setup — a small but real convenience the other two Dell monitors in this lineup lack entirely.

Colour performance

95% DCI-P3 and 99% sRGB are genuinely strong figures for a VA panel at this price. Suitable for: general office work and casual photo or video review comfortably. Limitations: the VA panel’s off-angle colour shift and the absence of a published Delta E accuracy figure mean this is not the right choice for colour-critical professional design or photo editing work — the Asus ProArt PA27JCV or Dell U3225QE, both covered in our buying guide, are better suited to that specific need.

Strengths

• Genuinely accessible price for a 34-inch curved ultrawide with 120Hz and strong colour figures for its panel type.
• Built-in 10W speakers — the only monitor in this cluster with any audio output at all.
• Front-facing quick-access ports genuinely reduce reaching behind the panel for temporary connections.
• Single USB-C cable covers video, data and 65W charging together.

Weaknesses

• No dedicated DisplayPort connector — video over USB-C only, via DP Alt Mode.
• No swivel or pivot adjustment at all, and at least one independent hands-on review found the height range genuinely too limited for some seated setups.
• VA panel colour and brightness shift off-angle, and no published Delta E figure for verified colour accuracy.
• 65W USB-C power delivery is meaningfully less than the U3225QE’s 140W Thunderbolt option.
• We cannot yet confirm any of this hands-on ourselves — findings here are drawn from Dell’s documentation and independent testing.

Alternatives

The Dell SE2725HM is worth choosing instead if you do not need the extra width and want a simpler, cheaper single monitor for general office work. The Dell UltraSharp U3225QE is the better choice if colour-critical work or a full Thunderbolt docking setup matters more to you than ultrawide screen space. The Asus ProArt PA27JCV and Samsung Smart Monitor M7 are also covered in our buying guide — the ProArt for genuinely colour-critical creative work, the M7 if smart TV features matter to you specifically.

Value for money

At roughly £300–350, this delivers a genuinely capable ultrawide — colour figures close to a monitor costing three times as much — for a fraction of the premium price. The value case weakens specifically if the height-adjustment limitation independent testing found means you need to buy a separate stand or arm on top of the purchase price, which narrows the gap versus stepping up to a monitor with a more capable stand from the start.

Prices shown are UK retail at the time of writing and change frequently. Always confirm the current price with the retailer before buying.

Who should buy it

Anyone wanting to replace a dual-monitor setup with one screen for general productivity work, at a genuinely accessible price, whose desk and seating height suit the stand’s available range.

Who should avoid it

Anyone needing a native DisplayPort connection, colour-critical accuracy with a verified Delta E figure, more than 65W of USB-C charging power, or whose desk and chair height would push against the stand’s limited adjustment range.

Frequently asked questions

Final verdict

A genuinely capable ultrawide at an accessible price, not a flawless one. The colour figures and built-in speakers are real strengths for the money, but the height-adjustment limitation an independent reviewer found is worth checking against your own desk before buying — not a footnote to skim past, since it is the kind of thing a spec sheet alone will not reveal.

See our best monitors for home office guide for how this compares against the other four picks, our home office monitor guide for the principles behind this review, or our home office setup guide for the broader decision this fits into.

Last reviewed: 24 July 2026. Next review due: October 2026.