Compare ASUS ROG Strix XG27ACS vs KOORUI S2721PM

The stand is straightforward to assemble, and the joystick-controlled menus make everyday adjustments easy.

Everyday operation is straightforward with a responsive joystick, but manually switching dimming modes and managing color calibration can feel tedious.

SDR material looks unusually accurate even with HDR mode active, minimizing the need to swap Windows display modes.

Switching between HDR and SDR can trigger brightness, color, and local dimming quirks that sometimes need resetting.

The enclosure stays comfortably cool to the touch in use, without drawing attention to heat buildup.

The panel can become noticeably warm when local dimming is unexpectedly disabled, raising concern during bright prolonged use.

Dark scenes look noticeably gray rather than inky black. The limitations are particularly apparent beside VA, mini-LED, and OLED displays.

Mini LED dimming can make night scenes noticeably darker than ordinary IPS, but deep blacks and small highlight control still lag stronger VA screens.

ELMB can make fast motion clearer, especially at high refresh rates. Brightness loss, double images, crosstalk, and red fringing leave opinions sharply divided.

KOORUI’s DIC black-frame insertion produces excellent motion clarity with surprisingly usable brightness. It does require disabling VRR and local dimming.

Colorful adventures look impressive, but dark cinematic scenes suffer from gray blacks and modest HDR. Better-contrast rivals suit this style more.

RPGs and visually detailed solo games benefit enormously from luminous highlights, wide color, and strong HDR contrast.

Crosshairs, FPS indicators, shadow adjustment, color modes, and adjustable blur reduction offer useful gaming customization.

HDR Auto is the preferred choice; Movie and Game HDR modes can lift blacks and damage contrast. SDR presets also need careful color selection.

Brightness and color uniformity are acceptable for games, but testers note some edge variation.

Brightness variation across the panel is very low in detailed testing, and the corners show little distracting falloff.

Standard 100×100 VESA support gives buyers the option to replace the supplied stand with an arm or wall mount.

A 100×100mm mount is supported, but one test found standard 10mm screws too short; 12mm M4 screws may be needed.

The wide color range makes games and images lively, though coverage is more conventional than high-end quantum-dot or OLED alternatives.

Quantum-dot color coverage is unusually wide for the price, extending through DCI-P3 and Adobe RGB. Wide gamut is not a substitute for accurate calibration.

Unusually effective variable overdrive delivers a reliable one-setting experience. The highest slider levels can create unwanted inverse ghosting.

The Fast setting brings response times under control without excessive artifacts; the very fastest setting introduces significant overshoot.

The matte finish usually keeps reflections manageable, but direct sun or strong daylight can still wash out the image.

The matte finish reduces visible glare well in daylight, although one detailed hands-on test and an owner found its texture or reflection behavior less refined than ideal.

The default overdrive setting produces very little ghosting or overshoot across refresh rates. Pushing overdrive too hard can introduce inverse trails.

Moving objects show relatively little trailing, and the strobing mode produces minimal double images when configured well.

Fast pixel transitions, low latency, and 180Hz refresh suit quick multiplayer games particularly well. Extreme esports players may still want higher refresh rates.

Response times and strobing make fast play credible, but the screen is not the best choice for the most demanding esports competitors seeking 240Hz or higher.

The self-contained power supply avoids an external brick, but the sealed design is a drawback if power components ever need service.

The power adapter is external rather than integrated, adding a brick and another cable to manage.

DisplayPort, HDMI, and USB-C video provide useful flexibility, but a single HDMI on some configurations and missing USB-A hub limit elaborate setups.

Video connections cover basic PC and console use, but older HDMI, no USB connections, and few office extras hold back its versatility.

IPS viewing angles are broad enough to comfortably share the image, even if off-axis performance is not a class leader.

Side views stay comparatively consistent, useful when other people watch or play nearby. A heavy anti-glare coating may still affect some viewing angles.

Both major PC adaptive-sync ecosystems are supported, helping reduce tearing without demanding one graphics-card brand.

Adaptive refresh works over DisplayPort and HDMI, including PS5 VRR in direct testing. Other sources caution against assuming every console output mode is supported.

The lack of onboard speakers is disappointing beside similarly equipped alternatives, especially for a simple all-in-one desk setup.

There are no built-in speakers, so external audio is necessary.

Several owners appreciate the solid finish, while others find the conventional plastic construction and chunky body clearly budget-minded.

Careful bezel assembly helps it avoid looking cheap, but its all-plastic chassis is not particularly luxurious.

A 1440p, 180Hz IPS panel with adaptive sync fits mainstream PC graphics hardware well, delivering smooth games without the burden of 4K.

DisplayPort unlocks QHD at 200Hz, while fast response and HDR produce a strong PC gaming experience once settings are tuned.

QHD on a 27-inch panel renders game interfaces and everyday text clearly, though fine detail is below native 4K.

Text generally looks crisp from a normal desk distance and is comfortable for office tasks. Higher-resolution 4K models still show finer detail.

USB-C accepts a video signal, but its 7.5W charging output is far too weak for laptop power or an easy one-cable workstation.

There is no USB-C charging or power delivery, so it cannot charge a connected laptop.

The 1440p image and variable refresh support make it appealing for responsive console play, but HDMI 2.0 and the absence of 4K limit the experience.

The monitor supports PS5 at 1440p/120Hz with VRR in hands-on testing, but HDMI 2.0 prevents 4K/120Hz and limits some Switch 2 HDR combinations. It is more straightforward for PC gaming.

Very low processing delay makes controls feel immediate, including at lower fixed refresh rates.

Input response is extremely quick at gaming refresh rates, with no appreciable delay expected for most players.

Some find the base compact and practical for smaller desks; others consider the deep, heavy stand a substantial space commitment.

The stand has a space-saving base, though the external power brick adds some clutter to the desk area.

A cutout in the adjustable stand provides a practical way to route cables and keep the desk tidier.

A cable pass-through in the stand helps keep basic video and power leads tidy.

The overall experience earns strong praise as an affordable, capable gaming setup, especially from owners upgrading an older or 1080p display.

The display earns strong marks for its surprising performance at a budget price, especially once HDR and color are configured. Buyers nevertheless report software quirks that can undermine an otherwise impressive panel.

The 2560×1440 resolution strikes a well-liked balance between crisp visuals and manageable GPU demands at 27 inches.

The 2560×1440 panel gives sharp enough text for ordinary desktop work and a good gaming-detail balance on 27 inches. A 4K alternative remains noticeably sharper for text.

Pixel response is exceptionally quick for this class, with balanced default settings that avoid large overshoot penalties.

Response is good for an IPS gaming display and competes well with similarly priced monitors. Tuning matters because the most aggressive overdrive setting overshoots.

The matte coating contains moderate grain, a small clarity tradeoff for its anti-reflection properties.

The coating controls reflections, but its relatively aggressive texture can be noticeable up close and may affect off-angle clarity.

Height, swivel, tilt, and portrait pivot are repeatedly praised for comfort and flexibility. A few find the maximum height a little short.

Height, tilt, swivel, and pivot adjustments are unusually comprehensive for a budget gaming display. Movement is reported as smooth and convenient.

The fast IPS panel excels at responsiveness and viewing angles but cannot escape its native contrast limitations.

The fast IPS panel offers steady off-axis color and good motion response, with weaker native blacks than VA rivals.

There are no downstream USB-A ports, making the monitor disappointing as a peripheral hub or simplified docking station.

There is no USB hub, which is inconvenient for keyboards, peripherals, and laptop-based workflows.

Readable text and accurate colors make this more than a gaming-only screen, although it lacks advanced workstation connectivity.

The monitor works well for everyday office tasks thanks to its clear text and adjustable stand, but the lack of USB and KVM functionality limits all-in-one workstation convenience.

The 180Hz maximum makes gameplay fluid and responsive for the price, though enthusiasts seeking 240Hz or more may want another model.

The 200Hz headline is a meaningful upgrade over 60Hz and slightly faster than some close competitors. Some owners drop to 144Hz to avoid visible scanline artifacts in certain modes.

Motion is exceptionally clean for an affordable IPS monitor. ELMB can sharpen fast movement further but adds distracting tradeoffs.

Fast IPS response and effective strobing keep motion relatively clean, making gameplay smoother than slower alternatives. The DIC mode is especially effective at reducing blur.

HDR400 can add a little color and brightness excitement, but poor blacks and no local dimming prevent convincing HDR highlights.

Bright highlights and localized backlighting make HDR the clear highlight of this monitor, provided the Auto HDR mode is used. Haloing and inaccurate alternative presets remain compromises.

There is no local dimming hardware, so HDR cannot isolate bright highlights from dark backgrounds.

The 1,152-zone system strengthens HDR depth at a remarkably low price, yet halos, small-object dimming, and occasional mode-reset behavior leave it short of premium implementations.

Excellent sRGB factory tuning is a consistent standout, with impressive accuracy before calibration. Some default wide-gamut settings can oversaturate standard content.

Factory settings and several color modes can look too cool, warm, or saturated depending on configuration. Manual calibration improves results, but critical color work needs care.

IPS contrast leaves shadowy scenes looking gray and washed out. Brighter colorful games flatter this panel much more than dark cinematic material.

Mini LED dimming significantly improves apparent HDR contrast over ordinary IPS screens, but native IPS contrast is modest and VA competitors render darker blacks.

The joystick and clear menus give easy access to extensive color and gaming settings without excessive button hunting.

The joystick-driven OSD is fast and intuitively organized, though options are limited and some owners dislike how changing modes affects their image.

The HDR label overpromises what the actual edge-lit hardware can deliver, despite otherwise capable motion specifications.

KOORUI’s own specifications conflict about USB, display brightness terminology, and warranty duration; buyers should verify seller terms.

A missing USB hub means it cannot serve as a KVM for sharing keyboard and mouse peripherals between computers.

The missing KVM switch prevents easy keyboard-and-mouse sharing between computers.

FreeSync and G-Sync support help keep gameplay smooth across changing frame rates. Variable overdrive also keeps artifacts in check as refresh falls.

Variable refresh is supported over both major video connections and helps avoid tearing across a broad gaming frame-rate range.

DisplayPort and USB-C DisplayPort Alt Mode make the fastest refresh settings accessible from compatible PCs and laptops.

DisplayPort 1.4 is the connection to use for the full 200Hz PC experience. HDMI is limited to a lower refresh rate.

SDR brightness is punchy enough for ordinary indoor gaming and many brighter rooms. Turning on ELMB cuts that headroom substantially.

Both SDR and HDR are notably bright, with vivid highlights that can dominate a scene. The minimum brightness may be too high for sensitive night-time users, and some owners find bright white transitions uncomfortable.

Sharp, colorful, well-calibrated SDR imagery is the major attraction. Weak blacks hold it back for dark or HDR-heavy material.

The panel can produce excellent HDR color, brightness, and contrast for the money. SDR out of the box looks less polished and may require work.

Shadow Boost makes dark details easier to see, though pushing those shadows can spoil the atmosphere of some games.

Shadow enhancement offers some useful adjustment, but stronger settings wash out the screen instead of selectively brightening dark areas.

One extended hands-on account describes the display as a dependable gaming companion, though broader lifespan claims remain premature.

An owner in the discussion reported losing half the backlight within a week, while others have had satisfactory use. Long-term dependability remains uncertain.

Its motion tuning, color accuracy, and ergonomic stand are excellent for the money, especially on sale. Less expensive rivals can be better for HDR or particular features.

Mini LED HDR, a fast QHD screen, and wide color coverage deliver unusually strong value at discounted prices. The appeal is less clear when pricing rises toward more fully equipped rivals.

HDMI is limited to version 2.0 and a lower refresh ceiling than DisplayPort, reducing flexibility for demanding console setups.

HDMI 2.0 is the major connection compromise: it cannot drive the panel at its 200Hz maximum or provide 4K/120Hz console output. A separate hands-on test did confirm PS5 VRR at supported lower resolutions.

Assembly is easy and factory tuning is strong enough to enjoy games immediately, without a lengthy calibration process.

Mechanical assembly is straightforward and requires no screwdriver. Display color calibration, however, can be considerably more complicated.

DisplayWidget gives convenient desktop control of the monitor, complementing the usable built-in menus.

There is no official Windows OSD control software, leaving owners to use hardware controls or third-party alternatives.

The DisplayWidget utility provides functional software control, although its value depends on the connected PC and setup.

Generic display drivers work, but absent dedicated tools complicate calibration, settings recovery, and troubleshooting.

Excellent sRGB modes and ample tuning options make accurate colors achievable with little extra work; the calibrated preset restricts some controls.

Manual RGB and color-mode adjustments can substantially improve grayscale accuracy, but configuring SDR and HDR separately can take patience.

The restrained front and slim bezels appeal to those who dislike aggressive gaming styling, although the bulky rear and foot divide opinion.

The understated, narrow-bezel design looks cleaner than a typical inexpensive gaming monitor, without flashy lighting.

The plastic body and sturdy stand generally feel well assembled for the price, even if the materials do not rival expensive flagship monitors.

The body uses budget plastic but fits together neatly, and owner feedback on construction is generally positive.

The 27-inch format feels just right for close desktop gaming and gives QHD content pleasing sharpness.

The 27-inch screen is seen as a useful sweet spot for detailed QHD games and ordinary desk work.

The conventional 16:9 screen is a comfortable fit for desktop and PC gaming, without the width or special layout of an ultrawide.

Individual tested units show little noticeable corner glow or bleed, though the appearance changes when local dimming is off.

Halos can form around subtitles, cursors, and bright objects on black backgrounds. Some viewers find them mild, but they are more obvious in dark scenes.

The IPS LCD avoids the burn-in worry associated with OLED screens, a reassuring advantage for static desktop elements.

The main owner received a panel without visible dead pixels or backlight bleed, although other units in the discussion showed defects.

USB-C video input offers a convenient connection for supported laptops and mobile devices, though it is not a full laptop dock.

A printed sRGB calibration report is supplied, but one tester found that its claim did not match perceptually accurate color.

Very narrow bezel gaps are less likely to collect dust than the wider seams on some competing displays.

No firmware version is exposed and there is no practical user firmware-update path, making future bug fixes uncertain.

The package is relatively bare, with little beyond the stand and basic cables to get started.

Simple packaging uses sturdy, dense foam to protect the screen during shipping.

The slot in the base can neatly hold a phone for guides or calls, but large phones may not fit and some find it gimmicky.

The screen itself is manageable to handle, but the heavy stand and wide foot can make rearranging a compact desk awkward.

Energy use is typical and reasonably efficient for a 27-inch IPS LCD without costly local dimming.

A sealed internal power supply and guidance toward professional service make self-repair less appealing.

Stock differs sharply by region: some sellers have had ample inventory or discounts, while other buyers report no local listings or sell-outs.

Fine horizontal line patterns can appear on saturated static colors, especially near 180Hz. Owners report improvement at 144Hz and sometimes 200Hz, but the defect can be a deal-breaker.

Wake is somewhat slow and may flash odd colors; one reported dimming configuration also failed to reapply after a long sleep.

The stand secures firmly during assembly and is a practical base for everyday use.

ELMB can introduce visible red fringing around moving elements even at high refresh rates.

A threaded mount above the screen offers an unusually convenient place to position a webcam or other compatible camera gear.

VRR flicker is generally minimal and is mainly a risk during unusual very-low-frame-rate swings.

The display can gently reduce brightness on extended bright screens, which one owner finds easier on the eyes.

Tight-fitting bezel seams leave fewer dust-catching gaps than some competing designs.

PIP and PBP are described as useful for displaying more than one input, although other reviewers focus on limited USB-based productivity features.

The small USB-C power output cannot adequately power a laptop and offers little beyond light charging for smaller devices.

Flicker-free backlighting is a useful advantage for sensitive viewers, though minimum screen brightness can be uncomfortable in a dark room.

Warranty terms may vary by region and are not entirely consistent between printed claims and retailer pages; buyers should confirm local coverage.