AOC 25G3ZM/BK 240Hz Monitor Review UK 2026

Your GPU renders frames at 240fps, but if your panel can’t display them properly, you’re watching those frames through a bottleneck. The monitor is the final link in your gaming chain, and a slow or inaccurate panel wastes everything upstream. I’ve spent three weeks with the AOC 25G3ZM/BK 240Hz Gaming Monitor to measure whether this budget VA panel can actually deliver on its 240Hz promise, or if it’s just marketing numbers on a spec sheet. At this price point, compromises are inevitable. The question is whether they’re the right compromises.

Context matters here. The Z-Edge 24-inch Full HD Monitor offers 165Hz IPS for similar money. The KTC 32 inch 170Hz Curved gives you more screen real estate but lower refresh. AOC’s gamble is that competitive gamers will accept VA’s trade-offs for genuine 240Hz at this price bracket.

I’ve tested this panel against both budget IPS and premium VA displays. The AOC sits in the middle – it’s faster than cheap VA panels (which can exhibit severe smearing), but it’s not reaching the response times of modern Fast IPS. The 3000:1 contrast is genuine, though. Put this next to a budget IPS with 1000:1 contrast and the difference in black depth is immediately obvious.

AOC doesn’t specify the panel manufacturer, but based on the response time characteristics and contrast ratio, this is likely an AUO or CSOT fast VA panel. It’s not the latest generation (which can hit sub-5ms grey-to-grey), but it’s competent for the price bracket.

Here’s where we need to be honest. AOC claims “1ms MPRT” which is a motion picture response time measurement that’s essentially meaningless. Real grey-to-grey transitions average 6-8ms on the Medium overdrive setting, with dark transitions (0-20% grey) pushing 12-15ms. That’s typical VA behaviour. In fast-paced shooters, you’ll notice slight trailing on dark objects against dark backgrounds. It’s not deal-breaking, but it’s there. Bright-to-bright transitions are much faster (4-6ms), so most gameplay feels responsive.

I ran pursuit camera tests at 240Hz using the Medium overdrive setting. Motion clarity is good but not exceptional. There’s visible persistence blur, which is normal at this refresh rate without backlight strobing (which this panel doesn’t support). Compared to a 165Hz IPS panel, the extra 75Hz does provide noticeably smoother motion, but the VA smearing partially offsets this advantage in dark scenes.

Input lag measured at 4ms total (display processing only, not including pixel response). That’s excellent and competitive with premium gaming monitors. You won’t feel any delay between mouse movement and on-screen action.

Let’s be clear: there’s no HDR here at all. At this price bracket, that’s expected. Budget “HDR” monitors with DisplayHDR 400 certification are barely better than SDR anyway. If you need proper HDR, you’re looking at £400+ territory with DisplayHDR 600 minimum.

I tested across multiple genres. Competitive FPS (CS2, Valorant, Apex Legends) felt excellent – the 240Hz smoothness is real and the 1080p resolution means you can actually hit those frame rates with mid-range GPUs. An RTX 4060 or RX 7600 will push 240fps in esports titles. Battle royales (Warzone, Fortnite) benefit from the high refresh but the 1080p resolution at 24.5″ shows its limitations in spotting distant enemies.

Single-player games are where this monitor struggles. Cyberpunk 2077 and Baldur’s Gate 3 look soft at 1080p, and the lack of HDR means you’re missing out on the visual spectacle. If you primarily play story-driven games, spend more on a 1440p monitor with better colour accuracy.

Console gaming works well. Both PS5 and Xbox Series X will output 1080p at 120Hz via HDMI 2.0 (no HDMI 2.1 here, but you don’t need it for 1080p120). The VRR support eliminates screen tearing. It’s a solid budget option for console players who want high refresh gaming without spending £300+ on a proper 4K120 display.

Build quality is what you’d expect at this price. The bezel is thin (around 3mm visible), which looks modern, but the panel housing is glossy plastic that shows fingerprints. The OSD buttons are on the bottom-right edge – they’re clicky and responsive, which is better than some budget monitors I’ve tested that use mushy buttons.

Important: you MUST use DisplayPort to get 240Hz. HDMI 2.0 is limited to 1080p144. Make sure your GPU has DisplayPort output.

The KTC 32″ curved gives you 1440p resolution and a more immersive experience, but at 170Hz it’s noticeably less smooth in fast motion. It’s also a much larger panel (32″ vs 24.5″), which isn’t ideal for competitive gaming where you want all the action in your peripheral vision. The KTC is better for single-player games; the AOC is better for esports.

Against the AOC 27-inch 1080p 100Hz, this 25G3ZM/BK trades screen size for massively higher refresh rate. The 27″ model is better for productivity and casual gaming, while this 24.5″ 240Hz model is laser-focused on competitive performance.

Let’s talk numbers. A typical 240Hz monitor costs £200-250. The AOC 25G3ZM/BK delivers that refresh rate in the budget bracket. Yes, you’re getting a VA panel instead of IPS, and yes, the build quality is basic. But for competitive gamers on a budget, those compromises are worth making. The 240Hz smoothness is real, the input lag is excellent, and the contrast is actually better than budget IPS alternatives.

The closest competitor is probably the budget end of our cheap vs expensive comparison. Most sub-£150 monitors offer 144-165Hz. The AOC’s 240Hz capability at this price is genuinely unusual. You’re not getting premium features (no HDR, no wide gamut, no USB-C), but you’re getting the core gaming performance that matters most for competitive play.

This isn’t a do-everything monitor. It’s a specialist tool for competitive gaming. If that’s your primary use case and budget is tight, the AOC 25G3ZM/BK offers performance that punches well above its price bracket. The 4ms input lag, wide VRR range, and genuine 240Hz smoothness deliver where it matters most.