Compare KOORUI S2741LM vs AOC AGON PRO AG276QZD2

Two full-bandwidth HDMI 2.1 inputs help the panel handle modern console resolutions and high refresh rates.

The originally tested HDMI 2.0 inputs cap QHD refresh below DisplayPort performance and limit some console VRR features; later units are reported with different HDMI specifications.

This 4K/320Hz Mini LED feature set earns strong value praise at competitive prices; OLED and other Mini LED discounts can change the calculation.

Competitive pricing makes high-refresh QD-OLED attractive, but value falls sharply if newer rivals cost about the same or offer stronger HDR and HDMI features.

The included stand assembles quickly and is easy to position without extra tools or hassle.

Tool-free stand assembly and supplied cables simplify installation, with a quick attachment mechanism that generally feels secure.

A built-in KVM makes it practical to share peripherals across connected computers, with reliable Mac/Windows operation reported.

There is no integrated KVM for sharing keyboard and mouse control between two PCs, so switching computers is less convenient.

Well-configured gamut modes and profiling can look excellent; native colors may be oversaturated and HDR tones sometimes shift red.

SDR accuracy is a frequent strength, especially in the sRGB setting or after calibration, although some units need white-balance correction.

Its 1,152-zone Mini LED backlight brings strong HDR brightness and contrast, but dark-detail crushing, red-leaning color and muted tiny highlights divide opinion.

Contrast and select bright highlights are genuinely OLED-like, but HDR colors often look unexpectedly muted and the brightest full-screen scenes lack punch.

Unusually high SDR and large-scene HDR brightness makes the screen stand out, especially in daylight. Very small bright highlights are less striking than the peak figures suggest.

Typical desktop brightness suits many rooms, with occasional impressive HDR peaks. It falls short of brighter OLED and mini-LED rivals and struggles near strong direct light.

The shadow-boost control can reveal darker content, although raising it too far washes out blacks; a slight negative SDR adjustment can improve perceived contrast.

Shadow controls can reveal hidden dark detail without sacrificing the panel's absolute black capability, useful for dark games.

The joystick is intuitive once located, but buried options, repeated navigation and an easily hit mode button add friction.

Joystick navigation and a large settings selection are useful after familiarization, but the menu can feel cluttered or awkwardly laid out.

PiP and PbP let two video sources share the screen, adding welcome flexibility for multi-device desks.

Split-screen and inset-window modes make multiple connected video sources more practical, though USB control remains limited.

With local dimming enabled, contrast becomes far stronger than ordinary IPS and the scene looks punchier. Disabling dimming returns it to typical IPS contrast.

Pixel-level illumination yields nearly limitless contrast and exceptional dark-scene depth, especially when viewing conditions are dim.

Richly saturated images and outstanding large-scene brightness make it striking, but aggressive dimming is not ideal for every scene.

Rich SDR color, sharp gaming detail and striking black levels create a visually impressive image, even though HDR color is a weak point.

VRR works across the refresh range without the obvious flicker sometimes seen on competing panels.

G-SYNC-compatible and FreeSync operation generally removes tearing effectively, but OLED VRR flicker is a separate behavior to consider.

Bright saturated colors have impressive punch in games and HDR scenes, giving even muted scenery surprising vibrancy.

SDR colors can look punchy and lively, although HDR saturation is noticeably less convincing in the critical testing.

No coil whine was audible from either the screen or power brick in a quiet workspace.

Fanless passive cooling keeps the monitor quiet, without an audible internal fan to disturb a gaming or work setup.

HDMI 2.1 and 4K/120Hz support make current consoles easy to use; occasional 60Hz dimming flicker remains a caveat.

QHD 120Hz can be useful, but HDMI bandwidth, PS5 VRR limitations and Xbox HDR restrictions make it less flexible than a modern HDMI 2.1 display.

Factory calibration is undermined by the lack of downloadable ICC/ICM profiles; owners can get good results by profiling the display themselves.

An sRGB clamp gives standard content a more restrained appearance, and some units achieve particularly good accuracy in that mode.

The panel supports the 4K/120Hz signal expected from PS5, and reviewers report good console compatibility overall.

PS5 can use QHD high-refresh output on the tested configuration, but the absence of HDMI 2.1 VRR on earlier units is a significant limitation.

Controlled testing reported no visible VRR-induced flicker, even though separate 60Hz local-dimming flicker can occur.

Gamma or brightness flicker can appear in dark scenes, menus and unstable frame-rate situations. Several testers found it subtle in actual play, while others found it distracting.

A light matte coating suppresses bright reflections while preserving clarity, helping in lamp-lit rooms.

The glossy anti-reflective finish retains attractive clarity but can still reflect lights and nearby objects, especially in darker scenes.

Typical IPS breadth is compromised by off-axis glow and brightness shifts, especially with local dimming in darker scenes.

Color and contrast remain impressively stable when viewed from off center, consistent with the strengths of OLED.

Halos are relatively modest from directly ahead but become noticeable off-axis or around small bright shapes on dark backgrounds.

Bright objects have sharply defined edges without the halos that often appear around them on LED-backlit LCDs.

There is a useful choice of game and image modes, though the best contrast and HDR results often require some experimenting.

The monitor includes many game modes, but several overly darken shadows or distort colors; using the standard mode and manual adjustments usually works better.

The mix of HDMI 2.1, DisplayPort, USB-C, USB-A and audio output covers gaming PCs, consoles and laptops well.

DisplayPort, dual HDMI, USB-A and headphone connectivity cover basic gaming needs, but missing USB-C, KVM and full-bandwidth HDMI 2.1 limit versatility.

There are no integrated speakers; anyone relying on monitor audio will need headphones or external speakers.

Integrated speakers add convenience but opinions vary widely, from pleasantly clear voices to underwhelming sound quality.

Motion is generally clean at 160Hz, though inverse overshoot at lower refresh rates and smearing at 320Hz remain drawbacks.

OLED pixel transitions avoid the trailing and overshoot common to LCDs, even at reduced refresh rates.

The dense 4K panel makes fine detail and text notably sharper than standard 27-inch 1440p alternatives.

Games and standard images look detailed at 1440p, but non-native scaling softens the picture and lacks a fine-tuning slider.

The Game preset generally beats the Movie preset by showing more shadow detail and brighter scenes; the alternative can crush dark tones.

Several HDR presets offer brighter peaks or steadier midtones, but some apply unwanted sharpening, crushed shadows or unusual color changes.

The compact stand base leaves useful desk space for a keyboard, mouse and small riser instead of dominating the desktop.

The irregular, relatively flat base leaves usable room for angled keyboards and mice. Some find the asymmetry or depth bulky in smaller spaces.

The IPS LCD uses a conventional RGB stripe for clear text and avoids OLED burn-in, though native blacks and off-axis glow remain IPS-like.

The QD-OLED panel is praised for its rich color, fast transitions and per-pixel black levels compared with conventional LCD technology.

At 160Hz motion is generally crisp; the 320Hz mode can smear and its strobing option adds clarity at the cost of extra setup.

Fast-moving objects remain sharp without conventional ghosting, making the 240Hz experience a standout strength.

Good 160Hz pixel response keeps blur reasonably low, but transitions cannot fully keep pace with 320Hz and overshoot rises in aggressive modes.

Near-instant OLED transitions keep moving images clean, with negligible smearing or overshoot at high and moderate refresh rates.

Testing found generally even lighting, but another owner noticed edge darkening and some scene-dependent color shifts.

The panel generally looks even across its surface, though one unit showed a darker upper patch and a persistent brighter corner.

The easily removed stock stand exposes standard 100×100mm VESA points for a monitor arm.

A 100×100mm adapter supports monitor arms, though the added plate can increase wall clearance compared with recessed mounts.

Support spans common variable-refresh formats and the full gaming modes; certification status and detailed behavior vary.

Adaptive-Sync spans a useful refresh range and low-frame-rate compensation keeps tearing and stutter in check as performance fluctuates.

PC gameplay benefits from bright 4K and a high-speed alternative, but more responsive OLED models remain attractive for competitive-only buyers.

Connected over DisplayPort, the high-refresh QD-OLED experience is remarkably fluid with excellent response and strong SDR contrast. HDMI and HDR caveats make configuration important.

Measured input lag is low even at 60Hz, and gaming controls feel responsive across refresh settings.

Response feels especially immediate at high refresh, with low measured latency. Some testing found noticeably more delay at 60Hz and 120Hz.

Strong peak brightness does not extend to the smallest HDR highlights, which can be substantially dimmed to prevent blooming.

Small highlights can become impressively bright, yet peak modes can darken midtones or roll off highlights earlier than desired.

Two downstream ports provide useful peripheral connectivity, though their speed and limited count earned differing assessments.

The two rear USB-A ports help connect desktop peripherals, but a USB-B upstream cable and limited switching flexibility hold back more complex workflows.

Local dimming gives darker blacks than ordinary IPS, though KOORUI sometimes prioritizes brightness over the deepest possible blacks.

Individually lit OLED pixels produce convincingly deep blacks in controlled lighting, a striking improvement over typical LCD glow.

The 320Hz mode reduces resolution, but reaching something close to 320fps still depends heavily on the game and graphics hardware.

1440p at 240Hz is more attainable than 1440p at 360Hz or 4K, but demanding games still require a capable GPU to exploit the high refresh rate.

The 3.5mm audio output offers a handy way to route sound through the display and simplify desk cabling.

The 3.5mm output makes it easy to attach headphones without routing a cable directly to the PC.

Supplied video and connection cables make it easier to set up without buying separate leads.

HDMI, DisplayPort and USB cables plus a VESA adapter make it easy to connect different PC setups without extra purchases.

At 27 inches, 4K provides finely rendered text and detailed games, a noticeable improvement over more common 1440p screens.

The 27-inch 1440p combination provides comfortably detailed imagery without extreme GPU load, even if it is less fine than 4K.

Power draw can be high at maximum brightness while charging a laptop, although everyday brightness settings reduce consumption substantially.

Power draw drew some criticism relative to expectations, though high-refresh OLED performance is the intended tradeoff.

A discussion reported stock disappearing unexpectedly, so finding the model has not always been straightforward.

Strong demand has occasionally made this model harder to locate at its most attractive price.

Wide Adobe RGB and DCI-P3 support adds reach for photography and makes media colors vivid, although correct profiling still matters.

The QD-OLED panel provides a broad native color range that makes SDR content vibrant; actual HDR output does not always take advantage of that potential.

Native 4K and forceful HDR brightness make detailed single-player games a strength; the 160Hz setting is generally favored over low-detail 320Hz for cinematic play.

Dark, atmospheric environments and colorful open worlds benefit from the panel's rich contrast and immersive image.

The large external power brick is an inconvenience, although its long cable and relatively cool-running screen soften the drawback.

The external power brick adds clutter and needs its own placement rather than plugging a standard mains cable directly into the panel.

The rear RGB ring adds a clean accent without overpowering the setup, and it can be switched off for an understated look.

Customizable rear lighting adds personality, with several colors and effects available. Its glow can be subtle rather than an effective wall bias light.

Users and testers largely admire the bright 4K image and flexible refresh options, while noting local-dimming and color setup quirks.

Fast OLED gameplay and competitive pricing are compelling, but muted HDR color and occasional software bugs keep this from being an easy recommendation for everyone.

A substantial base keeps the screen fairly steady with little wobble, and the construction feels better than its price suggests.

Most units feel solid on the metal base, although one used sample sagged at full height and another showed minor wobble.

Careful calibration can deliver excellent measured accuracy, even though the provided factory workflow and missing ICC profile make setup less convenient.

Calibration can refine an already capable SDR image into excellent color accuracy, especially for work in managed color spaces.

The 1080p/320Hz image is playable rather than perfectly pixel-mapped; gradient and fine-detail artifacts appear more noticeable in slower games.

Non-native resolutions remain usable, although the resulting softness would benefit from a proper manual sharpness control.

A broad Adobe RGB gamut and strong calibrated results suit photography, including HDR image work, but factory profiles are absent.

Vivid OLED colors, wide gamut and good SDR calibration make editing photos visually satisfying, particularly for noncontinuous workloads.

The 1080p/320Hz mode makes fast multiplayer enjoyable, but softer detail and residual smearing mean speed does not equal perfect clarity.

Exceptional pixel response, sharp motion and high refresh make fast shooters feel immediate and controlled, provided the PC sustains high frame rates.

An LCD Mini LED panel avoids the burn-in anxiety associated with static work on OLED displays.

A broad set of pixel-shift, dimming and refresh options reduces maintenance worries, although protection cannot eliminate the underlying OLED burn-in risk.

FPS counters, game modes, a shadow boost and strobing provide useful gaming extras beyond basic refresh settings.

Crosshair aids, a sniper zoom, frame counter and shadow controls provide useful adjustments for players, though not every preset improves the picture.

Native 160Hz feels fast for 4K gaming, while the 320Hz option offers extra speed at the expense of resolution.

240Hz already feels extremely smooth and competitive at QHD, even though 360Hz rivals offer more headroom and some later units report 280Hz.

Dark detail varies by preset: the Game HDR mode and gentle shadow tweaks reveal more, while Movie and some gamut modes crush blacks.

Dark details generally have depth and nuance, though some settings crush the darkest grays and need adjustment.

Height, tilt, swivel and portrait rotation are smooth and extensive, making long desktop sessions easier to position.

Height, tilt, swivel and pivot adjustments suit varied gaming positions, with a premium-feeling mechanism on most units.

A stand channel and rear connection cover can hide cabling neatly, although the cover and narrow exit space can be fiddly.

A rear stand clip and neatly grouped connectors help route cables unobtrusively.

Sharp native 4K gives more detail to games and desktop text; choosing 1080p for 320Hz deliberately trades away that crispness.

QHD is an effective compromise between image detail and achievable high frame rates on a 27-inch display, though not as crisp as 4K for fine text.

The box presentation and included cable kit made an unusually good first impression.

Thoughtful packaging keeps the screen protected and presents the stand and accessories in a convenient layout.

Rear-facing ports are awkward to reach, and the cable cover creates a tight space for connecting leads.

Rear-facing USB and headphone connections work once installed but would be easier to reach on a side or lower edge.

HDR brightness remains adjustable, but missing color and black-equalizer controls can make shadow and highlight tuning frustrating.

HDR modes restrict brightness and other picture controls, leaving little scope to correct the washed-out color or adjust tone mapping precisely.

HDR EOTF tracking is mostly consistent but somewhat too bright in darker content, limiting strict accuracy.

Peak HDR modes prioritize short bright flashes at the expense of darker midtones, while alternate modes trade those peaks for steadier overall scene brightness.

Color presets clamp the wide gamut effectively, but the restricted RGB, gamma and temperature settings can frustrate fine tuning.

There are useful color controls in native mode, but sRGB and DCI-P3 presets lock away gamma, white balance and several adjustments, limiting fine-tuning.

At 60Hz, local dimming can flicker around moving elements, making frame-rate-limited console games less dependable than high-refresh play.

Its OLED response stays fast at 60Hz, but low-frame-rate play looks and feels markedly less fluid than running it closer to 240Hz.

Eye-care and e-book modes are available, but their appeal is limited by the lack of a meaningful dedicated low-blue-light preset in other testing.

Low-blue-light options and generally unobtrusive flicker behavior help make viewing comfortable, though some warming modes can look overly yellow or green.

Slim bezels look modern, but one owner noticed brightness falling away at the screen edges.

The reasonably narrow borders keep the front modern, though one assessment felt the side bezels were too prominent for a truly premium look.

The dark, restrained chassis works in a home office or gaming room, while the optional rear LED ring supplies understated flair.

The angular, asymmetrical design and RGB accents appeal to some as distinctive and premium; symmetry fans may dislike its unusual base shape.

The backlight was measured as flicker-free without PWM, including when local dimming was active.

The minor refresh-synchronized OLED brightness pulses went unnoticed in normal testing, although particularly flicker-sensitive users may react differently.

The monitor feels reassuringly solid for its price, with a stable metal-based stand and little creaking or wobble.

The sturdy materials and metal stand give the monitor a reassuring feel, with mostly favorable impressions despite isolated mechanical issues.

Default gamma is close to target and can bring out dark tones, while some alternative color modes lose near-black detail.

SDR gamma can track closely to the intended target, while certain preset modes darken near-black detail or deviate more noticeably.

SDR brightness generally feels steady, avoiding the aggressive full-screen dimming associated with some OLED displays. Peak HDR modes still shift brightness in bright scenes.

Switching modes is simple with a dedicated button, but toggling while a game is already running has caused a PC freeze.

DisplayPort is the preferred route to the full high-refresh gaming experience, while HDMI on older configurations runs at lower refresh rates.

Conflicting 240Hz and 280Hz descriptions make it important to confirm the exact hardware revision and supported input speeds before purchase.

High-zone-count backlighting creates strong HDR contrast but can dim small highlights and low-contrast desktop text.

DIC can make moving objects clearer with little crosstalk, but it requires VRR off and resets brightness and overdrive settings.

The speakers have very little low-end output, leaving music and game audio thin and lacking weight.

Ten-bit HDR rendering allows closely spaced dark shades to retain subtle gradations and texture.

Native 4K at 160Hz is sharp for detailed games, while 1080p at 320Hz prioritizes competitive speed. The faster mode sacrifices detail and can expose motion or switching quirks.

Firmware updates are possible, but publicly available update packages were not readily found on the manufacturer site.

Frame skipping was observed before a G-Menu software update, so the initial smoothness problem makes software versions worth checking.

One hands-on assessment found the image softer over HDMI, adding a connection-specific compromise to its otherwise sharp PC performance.

The main image-quality disappointment is muted or washed-out HDR color despite the panel's broad native gamut. Some settings can improve the look but not fully solve the calibration issue.

A small rear hook gives headphones a convenient home without occupying extra desk space.

One owner found the monitor noticeably cooler than their other 4K displays at similar brightness settings.

A faint zone flicker can appear around moving details at 60Hz, with some owners finding it intrusive during console gaming.

A Mac and Windows test found reliable KVM switching and wake handling, making the monitor viable for Apple-based desks.

The nearly identical AG276QZD and AG276QZD2 names conceal different OLED technologies, while 240Hz versus 280Hz reports can complicate choosing a specific unit.

Protective pixel shifting and refresh routines are manageable for some owners but distracting or inconvenient for others during slow work sessions.

Fast is the safest general-purpose choice; Fastest can add distracting bright and dark overshoot, especially as refresh rates change.

Pixel-refresh prompts and automatic maintenance can interrupt prolonged sessions, though controls and standby behavior offer some ways to schedule the cycles.

At around 6.7kg with the stand, the unit may be too heavy for buyers prioritizing a lightweight monitor.

The monitor reliably recognizes connected computers after sleep, typically taking several seconds to display their picture.

The semiglossy surface gives images a clean, crisp look with little matte grain, provided room lighting is controlled.

Windows-side HDR toggling can simplify switching, and one owner successfully kept the screen in HDR using brightness utilities.

One test found laptop wake reliably handled, while an owner complained that the backlight remained lit in standby.

The internal speakers are usually considered thin and lacking bass; one listener liked their clarity, but dedicated audio is a safer bet.

The speakers can be turned down to a quiet, usable level for late-night listening without disturbing others.

The QD-OLED's colored text edges are easy to overlook in games, but some people find small lettering noticeably fuzzy during long work sessions.

90W USB-C charging and video simplify laptop connections, though very power-hungry laptops may still drain battery.

4K/120Hz console content works, but 4K/24Hz input is not supported, which may matter for some film sources.

Joystick control is usable, but its angular shape and placement can lead to missed clicks, accidental presses or awkward access.

G-Menu changes corrected frame skipping for some testing setups, but having to troubleshoot software just to achieve full smoothness is a nuisance.

G-Menu makes settings accessible, but frame skipping and update troubleshooting make software polish a concern.

90W USB-C power is sufficient for many laptops, but some high-end systems can draw more and slowly discharge under load.

PC use was reported as stable, with no black-screen or reset issues during testing.

A used stand sagged at full height, and software changes were needed to correct frame skipping in some setups; long-term dependability is not a clear strength.

Three-year coverage that includes eligible OLED burn-in offers welcome reassurance, subject to terms and maintenance requirements.

The 27-inch class balances gaming immersion with a manageable desk footprint, though it is not especially expansive for heavy multitasking.