Compare Asus ROG Swift 34 QD-OLED PG34WCDN vs ASUS ROG Swift OLED PG27UCDM

The OSD is generally intuitive and DisplayWidget makes adjustments easier, although reaching rear ports and enabling ELMB can be cumbersome.

The control joystick and logical menus make frequent adjustments quick and intuitive instead of cumbersome.

The 3440×1440 ultrawide format provides useful working space and sharp images, especially with RGB stripe. It is not as finely detailed as true 4K or higher-density rivals.

Packing 4K into a 27-inch OLED gives games, interface elements, and small text exceptional definition. The extra pixels are especially noticeable next to 1440p OLEDs.

Standard operation ranges from minimally distracting to noticeable flicker under unstable frame rates. Anti-flicker can help, but sacrifices useful VRR behavior.

Changing frame rates can cause noticeable flicker, especially in dark games. Anti-flicker settings help in some tests but do not reliably remove the problem.

The latest QD-OLED generation combines OLED's near-instant motion and deep blacks with improved text rendering and higher brightness.

QD-OLED delivers wonderfully deep blacks, vivid color, and fast pixel transitions. It also retains familiar limitations with ambient lighting and prolonged static content.

Presence-triggered shutoff and newer panel material help offset consumption, although running at the very highest refresh rate can raise power use.

OLED power consumption can exceed a comparable 4K LCD by a wide margin during bright full-screen content, despite modest use in mixed scenes.

A 34-inch ultrawide is less cumbersome than jumbo monitors, yet the broad, pronged stand takes room and is not everyone's preferred base.

The screen itself is a compact 27 inches, yet its deep, three-legged stand occupies a surprising amount of desk. A monitor arm may be worth considering.

The stand's cable cutaway and integrated switching simplify a desk with several connected devices, even if the wide monitor still needs substantial space.

Running peripherals through the built-in USB hub reduces desk cable clutter and keeps the computer's ports freer.

Automatic updates through DisplayWidget are useful, particularly for a monitor whose early firmware has drawn feature requests.

User-updateable firmware and automatic update support are welcome conveniences for keeping monitor controls current.

Detailed scenes, immersive 21:9 framing and vivid HDR make cinematic single-player games look superb.

Cinematic games look gorgeous thanks to deep blacks, highlights, and fine detail. A larger 32-inch screen can still feel more absorbing for single-player adventures.

Xbox and PlayStation signals work well, including 4K input downscaling and 120Hz play. Manual 16:9 selection and some ELMB restrictions make it less seamless than on PC.

PS5 and Xbox support reaches 4K at 120Hz, with Dolby Vision providing an extra option on Xbox. Console players cannot use the panel's full 240Hz rate.

Multiple major VRR formats are supported, but the anti-flicker setting narrows the active VRR range and can disable compensation at low frame rates.

Support for major PC and HDMI VRR formats makes the monitor flexible across devices and GPUs. Flicker with sudden frame-rate changes is the main caveat.

BlackShield noticeably lessens direct reflections and purple-tinted raised blacks. It cannot fully match the brighter-room black depth of some WOLED alternatives.

The glossy anti-reflective finish can handle ordinary indoor glare well, but direct lamps and windows remain troublesome. Opinions vary with lighting and where the screen sits.

Audio must come from external speakers or headphones. One owner does not mind the omission, but anyone wanting monitor audio will need another device.

There are no integrated speakers. That absence is especially inconvenient when watching shows or using the screen without external audio.

The newer coating maintains a clear, glossy-looking image while reducing reflected-light problems compared with earlier QD-OLED finishes.

The semi-gloss finish preserves a notably clear and vivid image without the grain of some matte coatings. Bright reflections remain an unavoidable compromise.

OLED delivers extremely deep blacks in controlled lighting, and BlackShield reduces the purple cast of older QD-OLEDs. In brighter rooms, blacks can still look gray.

Dark-room blacks look almost perfectly inky with no gray backlight haze. Direct lighting can make the QD-OLED panel appear grayish or purplish instead.

Black-frame insertion markedly sharpens motion at 120Hz and 180Hz. Requiring fixed refresh, disabled VRR and multiple setting changes reduces convenience.

ELMB improves perceived motion at 120Hz but halves brightness and disables HDR and VRR. It is helpful in particular games rather than a universal setting.

The updated panel material offers added brightness without a stated increase in heat generation, an encouraging efficiency improvement.

A custom heatsink enables effective passive cooling without relying on a fan, supporting a quiet desktop setup.

Pixel response stays clean across refresh rates without constant overdrive adjustments, making gaming setup simpler.

OLED's consistent fast response eliminates the need to juggle LCD-style overdrive levels across refresh rates.

Molded protection and neat internal packing keep the large display secure during delivery.

Cardboard-based packaging avoids polystyrene, an environmentally preferable choice that stands out from typical monitor shipping material.

Refined surfaces, sturdy construction and a slim OLED display section help it look the part of a flagship gaming monitor.

The solid materials and sturdy construction feel premium, even if the aggressive exterior details are not universally appealing.

Height, tilt and swivel adjustments are smooth and practical, although the stand does not pivot to portrait.

Height, tilt, swivel, and portrait rotation offer a wide adjustment range. Most movements are smooth, though tilt can feel stiff.

The stand is solid with little wobble, though its large pronged footprint does not always provide a clear advantage over smaller bases.

The sturdy stand holds its position with little to no wobble, even during joystick adjustments.

Its 90W USB-C supply comfortably exceeds basic charging-only ports and supports many laptops, even though one comparable MSI offers slightly more power.

The 90W USB-C connection can carry a laptop's picture, data, and power together. Higher-demand laptops may still need their own charger.

Shooter, strategy and other presets, plus crosshairs and performance overlays, add flexibility. Differences between some presets are subtle.

Crosshairs, Shadow Boost, and other game tools offer meaningful flexibility, though veteran players may find some automated extras unnecessary.

Instantaneous-feeling response, negligible input lag and 360Hz updates make this a standout for shooters and esports, assuming the PC can deliver high frame rates.

The 240Hz OLED speed, minimal input lag, and compact view make fast shooters highly responsive. It remains a demanding choice for PCs trying to push 4K frames.

The new RGB-stripe layout essentially eliminates the pink-green text fringes seen on older QD-OLED monitors, a major benefit for reading and work.

At this pixel density, the colored fringes associated with older QD-OLED monitors become very hard to notice. A few users may still spot artifacts in certain text or window edges.

Screen-wide consistency is generally excellent, with little dirty-screen effect, though faint banding can appear in dark material.

White and dark-gray fields look notably even, with little distracting dirty-screen effect on the tested panel.

This is widely considered an excellent high-end ultrawide, with stronger text, speed and HDR than previous generations. Pricing and some OLED compromises temper the enthusiasm.

The overall experience earns enthusiastic praise for a rare mix of 4K sharpness, 240Hz speed, and OLED imagery. Price, stand design, and OLED tradeoffs prevent a blanket recommendation.

The 21:9 view opens up peripheral game scenery and more desktop space. Alternative aspect ratios can help focus competitive play, but consoles require manual switching.

Selectable 4:3 and simulated 24.5-inch views give competitive players more control over their preferred playing field.

A cluster of USB-A ports plus USB-C and KVM support adds practical peripheral flexibility, with more ports than some rivals.

The built-in USB hub keeps keyboards and mice connected to the display and cuts down on cable runs to a desktop PC.

ELMB offers a useful way to increase motion clarity when running below 360fps, but is incompatible with variable refresh and not available at every rate.

OLED's extremely fast transitions deliver a major clarity advantage over LCD screens at comparable refresh rates, even without strobing.

The 360Hz refresh rate is a substantial jump over older 175Hz and 240Hz ultrawides, with the biggest payoff in games that can actually reach high fps.

At 240Hz, gameplay is exceptionally smooth without sacrificing 4K sharpness. Reaching that ceiling in demanding games takes a powerful PC.

Exceptionally low processing delay makes even fast shooters feel immediate and reactive.

Input lag is very low, making games feel immediate and responsive. The monitor is particularly attractive for fast competitive play.

Near-instant OLED response avoids obvious ghost trails and inverse-overshoot artifacts, including during VRR operation.

Fast-moving objects show little to no ghosting or overshoot. This is a major advantage over many LCD gaming monitors.

Clean text, multitasking width, USB-C charging and KVM switching make occasional work comfortable. Continuous static desktop use is a poor match for OLED longevity.

High-resolution text, excellent color, USB-C, and KVM make this more useful at work than many gaming displays. Heavy static desktop use remains a less comfortable long-term fit.

Pixel care, screen shifting, proximity-based shutoff and related settings help limit prolonged static exposure. They reduce risk rather than eliminate OLED burn-in.

OLED Care features include pixel maintenance, logo protection, and a useful proximity sensor. They reduce wear during varied use but cannot make permanent burn-in impossible.

High-bandwidth ports, VRR support and a 360Hz ceiling make it well equipped for modern PC gaming, from shooters to graphically demanding single-player titles.

A high-end PC can make excellent use of the 4K/240Hz panel's sharpness and low latency. More modest graphics hardware will not always reach the top refresh rate.

RGB-stripe subpixels remove the characteristic fuzzy text edges of older QD-OLEDs, giving unexpectedly crisp 1440p-class results.

The exceptionally dense 4K panel gives the monitor some of the cleanest-looking text and game detail available in desktop OLEDs. Fine edges look superb.

DisplayPort 2.1, dual HDMI 2.1, USB-C, several USB-A ports and a headphone output form a particularly well-rounded connection set.

DisplayPort 2.1, two HDMI 2.1 inputs, USB-C, and a USB hub give this compact display unusually broad connectivity. Its KVM adds everyday utility.

The built-in proximity sensor can black the panel when you leave and bring it back promptly when you return, supporting both convenience and care.

The proximity sensor can blank the screen when you leave and restore it promptly when you return. That makes daily use simpler while reducing unnecessary OLED exposure.

Per-pixel light control keeps bright objects from sprouting distracting halos, a significant OLED advantage over zone-dimmed LCDs.

Individual OLED pixels eliminate the bright halos commonly seen around small highlights and subtitles on zone-lit LCD displays.

Exceptionally broad DCI-P3 coverage and vivid QD-OLED color volume give games and HDR media rich, saturated tones.

The broad DCI-P3 and Adobe RGB coverage supports rich game color and detailed creative visuals. Wide-gamut material looks especially vibrant.

Screen-size emulation is flexible, but a tested 27-inch mode looked softer than expected pending a proposed firmware correction.

4K at 27 inches benefits from careful Windows or application scaling; small text and inconsistent software rendering can complicate otherwise crisp desktop use.

Smooth 360Hz updates and very fast OLED pixels make moving targets and camera pans extremely clean; lower frame rates show less benefit.

Rapid motion stays remarkably distinct, with moving objects and fine interface details easier to follow. Clarity remains impressive at lower refresh rates too.

Near-instant OLED transitions keep motion crisp and reduce smearing without distracting overshoot.

Near-instant OLED transitions keep action crisp from high refresh rates down to slower gameplay. Response performance is a clear strength.

VESA mounting provides a welcome route to an arm or alternative support instead of using the wide stock stand.

Standard VESA mounting is available and helps free up desk space. ASUS's required adapter bracket adds a small installation step.

Colors and brightness stay consistent from off-center positions, a familiar advantage of OLED technology.

Wide viewing angles keep color and contrast consistent well off-center, making the image easy to appreciate from different positions.

Picture-in-picture and side-by-side source modes are convenient when keeping two connected systems visible at once.

Picture-in-picture and picture-by-picture modes are available, but DSC restrictions reduce refresh and color options and require manual re-enabling afterward.

Shadow Boost can make darker SDR game areas easier to inspect, but its strongest dynamic setting also alters midtones noticeably.

Shadow Boost makes opponents hiding in dark areas easier to spot without demanding a separate software workaround.

The new panel produces brighter SDR images and impressive HDR highlights, with peaks near 1,300 nits in small areas. Large bright regions remain more restrained.

Brightness works well in typical indoor conditions, especially with the right settings. It cannot sustain the luminance of a bright LCD, and large white areas may look subdued.

Higher SDR brightness can fluctuate as white areas grow, while Uniform Brightness holds a steadier but lower level. HDR peak modes can also dim substantially in brighter scenes.

Automatic brightness limiting can make desktop windows change luminance as content shifts. Uniform Brightness largely fixes the distraction but caps maximum output.

Clear menu organization and a responsive joystick earn praise; DisplayWidget is often quicker for complex settings.

The joystick-controlled on-screen menus are responsive and easy to navigate. They also offer plenty of useful display adjustments.

HDR is a major strength thanks to pixel-level contrast and improved peak output. No single mode combines full accuracy, peak intensity and freedom from dimming.

Rich blacks and intense small highlights give HDR games and movies real impact. Large bright scenes and the compromises between HDR modes keep it short of a flawless presentation.

Dedicated sRGB and wide-gamut modes can be exceptionally accurate, and calibration results are excellent. Default oversaturation and inconsistent gamma in some modes call for attention.

Factory color is impressively accurate, particularly in the dedicated sRGB mode. Some HDR modes and the default wider gamut require more care for precision.

Full-bandwidth DisplayPort 2.1 UHBR20 can run 3440×1440 at 360Hz without DSC, a standout advantage for suitably equipped PCs.

Full 80Gbps DisplayPort 2.1 can deliver uncompressed 4K at 240Hz with compatible hardware, bypassing DSC-related limitations. The visible difference from working DSC is usually small.

The integrated KVM lets one keyboard and mouse follow a change between connected computers, avoiding extra desktop switching hardware.

An integrated KVM lets a keyboard and mouse move between a desktop and laptop without constant cable swapping. It's one of the more practical extras.

FreeSync and G-Sync compatibility help keep fast games smooth, with generally clean response even under changing frame rates. The dedicated anti-flicker mode brings its own limitations.

Broad adaptive-sync support generally keeps frame delivery smooth across different graphics cards. Uneven frame rates can still trigger OLED flicker.

Perfect-pixel OLED blacks alongside bright highlights create exceptional depth, especially in dark scenes.

Pixel-level light control produces outstanding scene depth and contrast, especially in darker rooms. Strong ambient light can diminish that striking effect.

Unlike zoned LCD backlights, individual OLED pixels can turn fully off next to bright pixels, avoiding halos.

Per-pixel dimming allows fine control of bright objects against black backgrounds, avoiding the zone-by-zone compromises of typical LCDs.

Vibrant colors, rich contrast, crisp text and clear motion produce a consistently striking image across work and games.

Fine details, vivid color, and inky blacks combine into outstanding image quality. The picture is most impressive with room lighting under control.

Aggressive ROG styling, sharp angles and RGB flourishes look striking to some but overly gamer-focused to others.

ROG lighting and logo projection lend a bold gamer look, but the large three-legged stand and flashy flourishes divide opinion. Several would trade the styling for a simpler base.

Blue-light modes are available, but certain settings conflict with Uniform Brightness and the strongest filter restricts brightness.

Blue-light filtering and generally flicker-free operation help comfort, although some filters cannot be combined with Uniform Brightness mode.

Solid construction, a refined finish and a sturdy stand help it feel premium. The angular gaming presentation may be more divisive than the physical quality.

Materials and assembly feel solid and high-end, with the sturdy stand and metal details contributing to a premium impression.

At 34 inches, the display adds horizontal room for games and windows without approaching the bulk of 39- or 49-inch models.

The 27-inch format brings unusually high pixel density and suits closer desk viewing. Some people still prefer a 32-inch OLED for a roomier canvas or more immersive games.

Performance and features are compelling, but the asking price is steep compared with capable 240Hz and 280Hz alternatives. The premium is easiest to justify for speed enthusiasts.

Exceptional performance comes with a high price, and several similar OLEDs are cheaper or larger. The premium is easiest to justify when its particular extras matter.

The HDMI 2.1 connections support demanding inputs and console gaming, though 360Hz over HDMI uses DSC.

The high-bandwidth HDMI 2.1 ports make modern PCs and consoles easy to connect. They're especially welcome alongside DisplayPort 2.1.

A three-year warranty explicitly covering burn-in adds reassurance, although it cannot rule out wear after coverage ends.

Three-year burn-in coverage is reassuring where the product's warranty terms confirm it. Coverage details should be checked for the region and SKU, and protection does not eliminate risk.

DisplayWidget software makes OLED care and color adjustments easier than navigating several levels of physical menus.

DisplayWidget Center makes adjusting monitor settings from Windows straightforward. Software and firmware controls add convenience beyond the OSD.

Adjustable sRGB and DCI-P3 options, six-axis saturation and software tools provide strong control. An Adobe RGB preset is missed, and one sRGB mode locks certain settings.

Accurate sRGB modes, gamma options, and HDR controls make fine-tuning flexible. The most accurate preset locks many settings, creating a convenience tradeoff.

Display Center can recognize games and automatically switch to appropriate picture presets; switching between strategy and shooter titles worked as intended.

The self-emissive OLED screen avoids the backlight bleed associated with many LCDs.

ELMB black-frame insertion gives lower-frame-rate games motion clarity approaching the monitor's native 360Hz mode, although it requires a more involved setup.

The illuminated rear branding and desk projection add attractive flair without being overly intrusive. They favor a distinctly gaming-oriented look.

The moderate 1800R curve is widely appreciated as immersive without the more aggressive wrap of earlier designs.

PC connections are broad, and supported PlayStation and Xbox signal formats work through the available inputs. Consoles still need aspect-ratio adjustment.

The full 360Hz advantage depends on sufficiently high game frame rates; heavy titles and weaker GPUs cannot always show the benefit.

Gray uniformity is strong overall, but mild banding appears in some darker gradients.

Tiny bright elements can reach around 1,300 nits, making neon, explosions and reflections stand out. Larger bright scenes can lose some of that punch.

A certified high-bandwidth DisplayPort cable is included, but its roughly one-meter length can be restrictive for separated PC and monitor positions.

The integrated power supply eliminates a separate external brick, simplifying cabling and desk placement.

Aspect-ratio modes were not remembered independently for different inputs in early testing, forcing manual changes when swapping PC and console.

Switching into Dolby Vision triggered repeated display blackouts when opening different programs, prompting a move back to standard HDR.

An integrated camera thread on the stand is genuinely useful for positioning webcam or creator accessories without another clamp.

Expansive 21:9 framing meets elite speed, striking contrast and smooth motion; the 34-inch curve feels immersive without overwhelming the desk.

Fingerprints and smudges wipe away more easily than on older QD-OLED coatings, a practical benefit for routine care.

Fanless operation keeps the monitor silent, avoiding a distraction found on some actively cooled displays.

Dolby Vision is a useful extra for compatible Xbox games and video, supplementing HDR10. One user found switching between programs disruptive enough to disable it.

Several measurements found gamma behavior outside the intended target, sometimes darkening or overbrightening content. Careful preset selection or calibration helps.

True Black 500 tracks the target curve more accurately but limits highlights. Brighter modes can overbrighten or dim scenes and sacrifice tonal detail.

ASUS Display Center provides mouse-based access to a wider range of display settings, though its experimental voice features were unreliable in one test.

The experimental voice-controlled settings feature failed to work despite troubleshooting, making it unreliable as a real convenience.

The harder coating is an improvement in principle, but scratches were seen on one tested sample, leaving real-world durability uncertain.