AOC Q25G4S — 24.5″ QHD 320Hz Fast IPS Gaming Monitor is AOC’s premier e-sports gaming monitor engineered for the competitive player who demands the highest refresh rate available at QHD resolution. Built on a 24.5-inch Fast IPS panel at 2560×1440 QHD resolution, the Q25G4S delivers a 320Hz refresh rate and 0.3ms MPRT response time — a combination that represents the current performance ceiling for QHD e-sports displays. NVIDIA G-SYNC Compatible certification, VESA DisplayHDR 400, 93% DCI-P3 colour gamut, Delta E < 2 factory colour accuracy, and Flicker-Free technology complete a monitor that is purpose-built for professional e-sports competition and extended high-intensity gaming sessions.

The Q25G4S is designed around a singular competitive philosophy: deliver the maximum temporal resolution — the number of visual updates per second — at QHD image quality, giving e-sports players the most complete and temporally precise representation of game state available at any QHD refresh rate. At 320Hz, the monitor delivers one frame every 3.125ms — a frame delivery frequency that reduces the maximum display pipeline delay to its physical minimum at QHD, minimising the gap between a game event occurring and the player perceiving it on screen. The dual HDMI 2.1 and DisplayPort 1.4 connectivity, full ergonomic stand with ±30° swivel, ±90° pivot, and 130mm height adjustment, alongside PiP/PbP multitasking capability and AOC’s complete gaming feature suite make the Q25G4S the definitive QHD e-sports display for players who compete at the highest level.

Technical Specifications

Key Features

•  320Hz Refresh Rate — The E-Sports Performance Standard at QHD Resolution: The Q25G4S operates at 320Hz — delivering 320 complete QHD frames per second, with one new frame appearing every 3.125ms. At professional e-sports tournaments and competitions, 320Hz has become the benchmark refresh rate that defines the highest tier of competitive display performance. The jump from 240Hz to 320Hz reduces inter-frame time from 4.167ms to 3.125ms — a 1.04ms reduction per frame that, at the competitive level where total system reaction time margins are measured in single-digit milliseconds, represents a meaningful reduction in display pipeline delay. At 320Hz, the Q25G4S delivers game state visual information to the player’s eyes at the highest frequency available on any QHD gaming monitor — 80 additional visual updates per second compared to 240Hz, and 176 more per second than the 144Hz standard. For competitive FPS, battle royale, and fast-action titles where enemy positions change rapidly and the timing window for a successful action can be less than a single frame at 60Hz, 320Hz provides the finest temporal resolution available to capture and display those critical moments
•  0.3ms MPRT Response Time — The Fastest Motion Clarity at QHD: The 0.3ms MPRT (Moving Picture Response Time) specification in the Q25G4S is the fastest MPRT available on any QHD gaming monitor. MPRT measures the duration of each pixel’s visible appearance during fast-motion sequences — lower MPRT means each motion frame is displayed for a shorter time before transitioning to the next, producing sharper, cleaner motion rendering with less blur trail. At 0.3ms MPRT with a 320Hz refresh rate, the combination of ultra-fast pixel hold time and ultra-high frame delivery frequency produces motion clarity that captures rapid movement with the minimum possible trailing and ghost artefacts. The 1ms GtG (grey-to-grey) response time confirms that the Fast IPS panel’s liquid crystal transition speed is sufficient for the 3.125ms frame window at 320Hz — pixel transitions complete within 32% of the available frame time, ensuring clean rendering without inter-frame ghosting at maximum refresh rate
•  Fast IPS Technology — IPS Visual Quality at 4× the Speed of Conventional IPS: Fast IPS is the high-performance IPS variant that eliminates conventional IPS’s speed disadvantage against TN panels by delivering 1ms GtG response time through an optimised liquid crystal compound and drive circuit. The Q25G4S’s Fast IPS panel provides the three competitive advantages that define Fast IPS’s position at the top of the e-sports monitor market: the 178°/178° viewing angles and colour uniformity of IPS (ensuring consistent colour accuracy regardless of viewing position — critical for team gaming environments and tournament setups where viewing angles vary); the wide colour gamut and Delta E < 2 factory colour accuracy of a premium IPS panel; and the 1ms GtG / 0.3ms MPRT response time of a competitive gaming panel. No other IPS panel variant at 320Hz provides the same combination of speed, colour quality, and viewing angle performance
•  QHD 2560×1440 Resolution — The Competitive Sweet Spot Between Detail and Framerate: QHD resolution at 24.5 inches produces 120 pixels per inch — significantly sharper than 1080p at the same size (90 PPI) while maintaining the GPU performance headroom required to sustain 320Hz framerates in competitive titles. For e-sports players, QHD at 24.5 inches represents the resolution that provides meaningfully more visual detail than FHD — sharper player models, cleaner UI elements, more precise crosshair rendering, and finer environmental detail — without increasing the rendering load to the point where sustaining 320fps becomes GPU-prohibitive. In QHD, character outlines, crosshairs, and distant objects are rendered with pixel precision that gives competitive players more visual information per frame than FHD can provide, while the 24.5-inch physical size maintains the compact, focused visual field that professional e-sports players prefer for fast target acquisition across the full screen area
•  NVIDIA G-SYNC Compatible — Certified Tear-Free VRR for NVIDIA GPU Users: NVIDIA G-SYNC Compatible certification confirms that the Q25G4S has been independently tested and validated by NVIDIA to deliver high-quality variable refresh rate performance meeting NVIDIA’s G-SYNC compatibility standard. For NVIDIA GeForce GPU owners — the dominant GPU family in competitive PC gaming — G-SYNC Compatible certification means the Q25G4S’s Adaptive-Sync VRR operation has been verified to be free from the quality issues (flickering, blanking, ghosting) that can affect uncertified monitors running G-SYNC in compatibility mode. At 320Hz with G-SYNC Compatible VRR, competitive players can enable tear-free Adaptive-Sync with the assurance that the VRR performance meets NVIDIA’s verified quality standard — not just the monitor manufacturer’s self-declaration. This certification is particularly meaningful for high-framerate competitive titles where GPU output varies significantly between scenes and VRR is essential for maintaining tear-free rendering throughout
•  HDMI 2.1 — Full 320Hz QHD for Both PC and Console Connectivity: The Q25G4S’s dual HDMI 2.1 ports provide 48Gbps bandwidth — the capacity required to transmit QHD at 320Hz over HDMI, unlocking the monitor’s maximum refresh rate for devices connected via HDMI. This makes the Q25G4S the rare 320Hz monitor where HDMI-connected devices — including gaming laptops with HDMI 2.1 output, gaming consoles, and secondary PCs — can access the full 320Hz refresh rate without being bandwidth-limited to a lower ceiling. For competitive players who game on a laptop via HDMI, the dual HDMI 2.1 ports ensure the Q25G4S delivers its full 320Hz performance regardless of the connection type, with two HDMI sources connectable simultaneously alongside the DisplayPort PC connection
•  VESA DisplayHDR 400 — Certified HDR for QHD E-Sports: VESA DisplayHDR 400 certification confirms the Q25G4S meets VESA’s independently verified HDR standard: 400-nit-class peak brightness with global dimming and 8-bit minimum colour depth. The Q25G4S delivers 350 cd/m² typical brightness and 450 cd/m² HDR centre peak brightness — exceeding the DisplayHDR 400 brightness requirement. For e-sports players who also enjoy AAA single-player titles with HDR support, the Q25G4S’s DisplayHDR 400 certification ensures those HDR titles display with the increased brightness headroom and colour depth that HDR was designed to provide, without requiring a separate HDR display. The 93% DCI-P3 colour gamut with Delta E < 2 calibration ensures HDR colours are rendered accurately against the wide gamut standard
•  93% DCI-P3 Colour Gamut — Wide Colour Beyond the sRGB Standard: The Q25G4S’s 93% DCI-P3 and 124% sRGB colour coverage exceeds the sRGB standard that most competitive gaming monitors in the 320Hz tier are limited to. DCI-P3 is the professional cinema colour standard with a significantly wider colour volume than sRGB — particularly in the red and green colour primaries where sRGB’s narrower gamut produces less saturated, less vivid colour rendering. At 93% DCI-P3 with Delta E < 2 factory calibration, game environments, character designs, and visual effects that were created with wide-gamut colour pipelines are rendered with the fuller, more saturated colour palette the development team intended — producing more vivid, visually engaging images than an sRGB-only monitor provides at the same settings
•  AOC Low Input Lag Mode — Hardware Pipeline Latency Minimisation: AOC’s Low Input Lag mode bypasses the monitor’s non-essential image processing stages to minimise the display pipeline’s contribution to total system input latency. For competitive e-sports players where total system input lag — the combined delay from input device to monitor display — is a key competitive variable, Low Input Lag mode ensures the Q25G4S’s contribution to that total is at its hardware minimum. At 320Hz with Low Input Lag active, the Q25G4S provides the combination of maximum temporal resolution (3.125ms inter-frame time) and minimum display processing delay — the two display-side factors that together produce the lowest possible display input lag at QHD resolution
•  6 Game Mode Presets — Instant Genre-Specific Optimisation: The Q25G4S provides six game mode presets — FPS, Racing, RTS, and three user-configurable Gamer slots — each applying genre-optimised colour, contrast, and sharpness adjustments that can be activated instantly. FPS mode optimises for enemy visibility, crosshair clarity, and fast-motion rendering in first-person shooters and battle royale titles. Racing mode enhances vivid colour saturation for racing environment immersion. RTS mode balances detail and colour accuracy for complex strategy game interfaces. The three Gamer slots store user-created custom configurations for specific game titles or personal visual preferences — allowing instant recall of saved settings without navigating full OSD menus during gaming sessions
•  AOC Game Color — Multi-Level Saturation and Grey Adjustment: AOC Game Color provides multi-level control over colour saturation and grey rendering — allowing competitive players and enthusiasts to optimise the Q25G4S’s visual output for both competitive visibility and personal aesthetic preference. In MMORPG and visual narrative titles, increased saturation enhances the richness and atmospheric quality of game environments. In FPS and tactical titles, grey level adjustment targets shadow area visibility — specifically the dark scene zones where opponents are most likely to be concealed — improving tactical visibility without applying a global gamma lift that would wash out the entire image. The multi-level control provides granular adjustment rather than the binary on/off of simpler colour modes
•  Flicker-Free DC Backlight — Certified Eye Comfort for Extended Sessions: The Q25G4S’s Flicker-Free technology uses a DC (Direct Current) backlight system that eliminates the PWM (Pulse Width Modulation) flickering that standard LED-backlit monitors produce when adjusting brightness. PWM flickering — invisible to the naked eye but detected by the visual system — causes eye fatigue, headaches, and visual discomfort during extended sessions. DC backlight maintains stable, continuous illumination at all brightness levels, eliminating the flicker source entirely. For competitive e-sports players and enthusiasts who spend multiple hours per day in front of the Q25G4S, Flicker-Free certification provides evidence-based assurance that the monitor’s backlight system is engineered for the eye safety requirements of extended high-intensity use
•  PiP and PbP — Multi-Source Multitasking on a QHD Panel: The Q25G4S’s PiP (Picture-in-Picture) and PbP (Picture-by-Picture) modes allow two separate input sources to be displayed simultaneously on the QHD panel. PbP mode splits the 2560×1440 display into two independent source zones — useful for monitoring a secondary device, running a dual-PC streaming setup where the gameplay PC and streaming PC are both visible, or keeping a reference screen active alongside the primary gaming source. PiP mode displays a secondary source as an inset overlay within the primary display without occupying the full screen. For streamers who run separate gaming and streaming PCs, PbP eliminates the need for a second monitor to monitor stream output alongside gameplay
•  Full Ergonomic Stand — 130mm Height, ±30° Swivel, ±90° Pivot: The Q25G4S’s premium ergonomic stand provides the complete range of positional adjustments: 130mm height range for precise eye-level alignment, -5° to 23° tilt, ±30° swivel for angled positioning in corner desk or multi-monitor configurations, and ±90° full bidirectional portrait pivot. For e-sports players who compete at LAN events and tournaments where desk configurations vary significantly from home setups, the full range of ergonomic adjustments ensures the Q25G4S can be positioned correctly at any venue. The ±90° bidirectional pivot enables portrait-mode use for productivity, document work, and vertical content review when switching between competitive gaming and work use cases. VESA 100×100mm mount compatibility supports monitor arm configurations for ergonomic setups that maximise desk surface clearance

User Benefits

•  The Tournament Standard — 320Hz Is What the Pros Use: Professional e-sports tournaments and competitions have adopted 320Hz as the standard refresh rate tier for high-level competitive play. Owning the Q25G4S means competing on the same display specification that professional players train and compete on — the same temporal resolution, the same 0.3ms MPRT motion clarity, the same minimum display pipeline delay. For competitive players who take their performance seriously, training on the same 320Hz specification used at tournament level ensures there is no refresh rate adjustment required when competing at events — the competitive advantage of 320Hz is consistent between practice and competition
•  More Visual Updates Per Second Than Any Other QHD Monitor — 320Hz vs 240Hz: Every second of gameplay on the Q25G4S delivers 80 more visual frames than a 240Hz QHD monitor — 320 complete QHD snapshots of the game world versus 240. Each of those additional 80 frames per second represents visual information about game state that a 240Hz display never shows the player — enemy position updates, projectile trajectories, character animation transitions — information that exists in the game engine’s output but is lost between refresh cycles on lower refresh rate displays. At the competitive tier where every visual advantage compounds into improved reaction time and game awareness, the Q25G4S’s 80 additional frames per second represent a meaningful and consistent edge over every 240Hz competitor
•  IPS Colour Quality Without IPS Speed Compromise: Competitive players who have used TN panels for their speed advantage but have been frustrated by TN’s limited viewing angles, colour reproduction, and image quality can switch to the Q25G4S’s Fast IPS panel without any competitive performance trade-off. Fast IPS provides 0.3ms MPRT and 1ms GtG — matching or exceeding the response time specifications of TN panels — while delivering IPS’s 178°/178° viewing angles, 93% DCI-P3 wide colour gamut, and Delta E < 2 colour accuracy. The visual quality improvement from TN to the Q25G4S’s Fast IPS is significant and immediately apparent; the competitive performance is maintained or improved
•  G-SYNC Compatible — Verified Tear-Free Performance for NVIDIA Players: NVIDIA GPU owners — the majority of high-performance PC gamers — can activate G-SYNC Compatible mode on the Q25G4S with NVIDIA’s independent certification confirming the VRR quality is verified. At 320Hz with competitive titles delivering variable framerates between scene loads, respawn sequences, and high-action combat, G-SYNC Compatible VRR eliminates tearing throughout those framerate transitions — providing consistently smooth, artefact-free gameplay that does not require V-Sync and its associated input lag penalty. The G-SYNC Compatible certification is the validation that the Q25G4S’s VRR implementation meets the quality standard NVIDIA requires
•  HDMI 2.1 at 320Hz — Maximum Refresh Rate for Laptop and Console Connections: Unlike many 320Hz monitors that restrict HDMI connections to lower refresh rates, the Q25G4S’s HDMI 2.1 ports support the full 320Hz at QHD — making it the first choice for competitive players who game on gaming laptops with HDMI 2.1 output and need the full 320Hz performance over HDMI. For players without a desktop PC, HDMI 2.1’s 320Hz QHD support means the Q25G4S delivers its complete competitive performance specification to any HDMI 2.1 source device, not just DisplayPort-connected desktop PCs
•  Eye Safety for Marathon Training Sessions — Flicker-Free and Low Blue Light: Competitive e-sports players who train for multiple hours daily and professional players who spend 6–10 hours per day in front of their monitor require a display engineered for eye safety at that usage intensity. The Q25G4S’s DC backlight Flicker-Free technology eliminates PWM-sourced eye fatigue, and Low Blue Light technology reduces the high-energy short-wavelength blue light that contributes to digital eye strain and can disrupt circadian rhythm during evening training sessions. Together, these two eye protection features make the Q25G4S the monitor that supports competitive performance over long sessions rather than degrading player performance through eye discomfort
•  Streaming Setup Ready — Dual HDMI 2.1, Dual-PC PbP, Low Profile: For streamers who run dual-PC setups — a dedicated gaming PC and a dedicated streaming/capture PC — the Q25G4S provides the complete dual-PC monitoring solution: dual HDMI 2.1 to connect both PCs simultaneously, PbP mode to display both sources side-by-side on the QHD panel for simultaneous gameplay and stream monitoring, and the 24.5-inch compact form factor that fits cleanly into desk setups alongside cameras, microphones, and capture hardware without dominating the physical workspace. The full ergonomic stand provides the flexibility to position the monitor correctly for both on-camera framing and extended session ergonomics