iiyama G-MASTER 24. 5″ Full HD Monitor
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About This Item
- 320 Hz refresh rate for ultra-smooth gaming performance
- Fast IPS panel with 1920 x 1080 Full HD resolution
- 0.4 ms response time for minimal motion blur
- G-Sync Compatible and AMD FreeSync for tear-free gameplay
- 150 mm height-adjustable stand for ergonomic comfort
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iiyama G-MASTER GB2591HSU-B1 | 320Hz Gaming Monitor with G-Sync
The iiyama G-MASTER GB2591HSU-B1 is a high-performance gaming monitor designed for competitive players who demand ultra-smooth gameplay and rapid response times. With a 320Hz refresh rate and 0.4ms response time, this 24.5″ Fast IPS display delivers the speed and clarity needed to stay ahead in fast-paced games.
Slim Specs Table
| Metric | Spec. |
|---|---|
| Screen Size | 24.5″ |
| Resolution | 1920 x 1080 (Full HD) |
| Refresh Rate | 320Hz |
| Response Time | 0.4ms |
| Panel Type | Fast IPS |
Ultra-Fast 320Hz Refresh Rate for Competitive Gaming
The standout feature of this iiyama monitor is its 320Hz refresh rate, which provides exceptionally smooth motion rendering for competitive gaming. This high refresh rate, combined with NVIDIA G-SYNC compatibility and AMD FreeSync support, eliminates screen tearing and stuttering for fluid gameplay. The Fast IPS panel technology ensures you get both the speed of TN panels and the colour accuracy and viewing angles of IPS displays.
0.4ms Response Time Minimises Motion Blur
With a rapid 0.4ms response time (MPRT), this monitor virtually eliminates motion blur and ghosting during fast-paced action. Whether you’re tracking opponents in FPS games or following quick movements in racing titles, the ultra-fast response ensures crisp, clear visuals without the distracting trails that can cost you crucial milliseconds in competitive play.
Ergonomic Design for Extended Gaming Sessions
The GB2591HSU-B1 features a fully adjustable stand with 150mm height adjustment, -45° to 45° swivel, and 5° to 23° tilt capabilities. The monitor also supports pivot rotation up to 90°, allowing you to switch between landscape and portrait orientations. Cable management is integrated to keep your gaming setup tidy, and the VESA 100x100mm mounting pattern offers alternative mounting options.
HDR Support and Enhanced Visual Quality
This monitor supports High Dynamic Range 10 (HDR10), providing improved contrast and colour depth for supported content. The 350 cd/m² typical brightness and 1000:1 contrast ratio deliver vibrant, detailed images, while the 16.7 million colours ensure accurate colour reproduction. The matte display surface reduces reflections, making it suitable for various lighting conditions.
Box contents
- Quick start guide
- Safety guide
- AC power cable (1.8m)
- USB cable (1.8m)
- DisplayPort cable (1.8m)
Check before you buy
- Confirm your graphics card supports 320Hz output at 1080p resolution
- Verify your gaming setup has space for a 24.5″ monitor with adjustable stand
- Check if you need HDMI 2.1 or DisplayPort 1.4 connectivity for maximum refresh rate
- Confirm the stand height adjustment meets your ergonomic requirements
Frequently Asked Questions
Q: Does this monitor support both NVIDIA G-SYNC and AMD FreeSync?
A: Yes, the GB2591HSU-B1 supports both NVIDIA G-SYNC compatibility and AMD FreeSync for tear-free gaming with compatible graphics cards.
Q: What is the maximum resolution and refresh rate combination supported?
A: The monitor supports 1920×1080 resolution at up to 320Hz refresh rate via DisplayPort 1.4 or HDMI 2.1 connections.
Q: Are built-in speakers included with this monitor?
A: Yes, the monitor includes two built-in speakers with 8W RMS rated power for basic audio output.
Q: Can this monitor be wall-mounted?
A: Yes, the monitor is VESA mount compatible with a 100x100mm mounting pattern for wall or arm mounting.
Q: Does the monitor include blue light reduction features?
A: Yes, it includes Low Blue Light technology and Flicker-free technology to reduce eye strain during extended gaming sessions.
The Consultant’s verdict & warranty
The iiyama G-MASTER GB2591HSU-B1 is an excellent choice for competitive gamers who prioritise speed and responsiveness above all else. Its 320Hz refresh rate and 0.4ms response time make it particularly well-suited for esports titles where every millisecond counts. The Fast IPS panel provides a good balance of speed and image quality, while the comprehensive ergonomic adjustments ensure comfortable extended gaming sessions. Covered by the standard Manufacturer Warranty.
| Display | |
|---|---|
| HDCP | Yes |
| Display brightness (typical) | 350 cd/m² |
| Screen shape | Flat |
| Display number of colours | 16.7 million colours |
| Native aspect ratio | 16:9 |
| Maximum refresh rate | 320 Hz |
| Display surface | Matt |
| HD type | Full HD |
| Display technology | LED |
| Contrast ratio (dynamic) | 100000000:1 |
| Viewing angle, horizontal | 178° |
| Viewing angle, vertical | 178° |
| Pixel pitch | 0.2802 x 0.2802 mm |
| Horizontal scan range | 30 - 360 kHz |
| Viewable size, horizontal | 54.4 cm |
| Viewable size, vertical | 30.3 cm |
| Display resolution | 1920 x 1080 pixels |
| Response time | 0.4 ms |
| Display diagonal | 62.2 cm (24.5") |
| Contrast ratio (typical) | 1000:1 |
| Touchscreen | No |
| High Dynamic Range (HDR) supported | Yes |
| Panel type | Fast IPS |
| Colour depth | 8 bit |
| High Dynamic Range (HDR) technology | High Dynamic Range 10 (HDR10) |
| Display diagonal (metric) | 62 cm |
| Response time (MPRT) | 0.4 ms |
| Audio | |
| Built-in speaker(s) | Yes |
| RMS rated power | 8 W |
| Performance | |
| Built-in speaker(s) | Yes |
| RMS rated power | 8 W |
| Built-in camera | No |
| NVIDIA G-SYNC type | G-SYNC |
| AMD FreeSync | Yes |
| NVIDIA G-SYNC | Yes |
| VESA Adaptive Sync support | Yes |
| Low Blue Light technology | Yes |
| Flicker-free technology | Yes |
| Management features | |
| On Screen Display (OSD) | Yes |
| On Screen Display (OSD) languages | Czech, German, English, French, Italian, Japanese, Dutch, Polish, Portuguese, Russian |
| Multimedia | |
| Number of speakers | 2 |
| Built-in speaker(s) | Yes |
| RMS rated power | 8 W |
| Built-in camera | No |
| Power | |
| Power cable length | 1.8 m |
| Power supply type | Internal |
| AC input voltage | 100 - 240 V |
| AC input frequency | 50/60 Hz |
| Power consumption (standby) | 0.5 W |
| Power consumption (typical) | 30 W |
| Power consumption (off) | 0.3 W |
| Energy efficiency scale | A to G |
| Energy efficiency class (SDR) | E |
| Energy efficiency class (HDR) | G |
| Energy consumption (SDR) per 1000 hours | 18 kWh |
| Energy consumption (HDR) per 1000 hours | 31 kWh |
| Design | |
| Market positioning | Gaming |
| Product colour | Black |
| Camera | |
| Built-in camera | No |
| Ports & interfaces | |
| Built-in USB hub | Yes |
| USB hub version | 3.2 Gen 1 (3.1 Gen 1) |
| Headphone out | Yes |
| HDMI ports quantity | 2 |
| DisplayPorts quantity | 1 |
| HDCP | Yes |
| HDMI | Yes |
| HDMI version | 2.1 |
| DisplayPort version | 1.4 |
| Number of downstream ports | 4 |
| Technical details | |
| Cable lock slot | Yes |
| HDMI | Yes |
| Product colour | Black |
| User controls | picture adjust (contrast, brightness, overdrive, HDR, Adaptive Sync, night mode, blue light reducer, Motion Blur Reducer, gamma), input select (input source), audio adjust (volume, mute), store user setting (user modes), color settings (6-axis, color temperature, user preset, black tuner), image adjust (i-Style color, X-Res Technology, sharpness, HDMI range, direct drive mode, video mode adjust), language, setup menu (OSD horizontal position, OSD vertical position, OSD time, opening logo, power LED, DDC/CI control, usb charge), display information, reset (reset all) |
| Sustainability certificates | ErP |
| Compliance certificates | CB, CE, EAC, PSE, REACH, RoHS, TÜV mark, VCCI, WEEE |
| Packaging content | quick start guide, safety guide |
| Power supply type | Internal |
| Weight (with stand) | 5.3 kg |
| Touchscreen | No |
| Ergonomics | |
| Wall mountable | Yes |
| VESA mounting | Yes |
| Cable lock slot | Yes |
| Panel mounting interface | 100 x 100 mm |
| Swivelling | Yes |
| Swivel angle range | -45 - 45° |
| Tilt angle range | 5 - 23° |
| Pivot | Yes |
| On Screen Display (OSD) | Yes |
| Pivot angle | 0 - 90° |
| On Screen Display (OSD) languages | Czech, German, English, French, Italian, Japanese, Dutch, Polish, Portuguese, Russian |
| Height adjustment | Yes |
| Cable lock slot type | Kensington |
| Cable management | Yes |
| Tilt adjustment | Yes |
| Adjustable height (max) | 15 cm |
| Weight & dimensions | |
| Width (with stand) | 557 mm |
| Depth (with stand) | 55.5 mm |
| Height (with stand) | 324 mm |
| Weight (with stand) | 5.3 kg |
| Package width | 630 mm |
| Package depth | 142 mm |
| Package height | 504 mm |
| Package weight | 8.03 kg |
| Width | 557 mm |
| Weight | 5.3 kg |
| Height | 324 mm |
| Packaging data | |
| Package width | 630 mm |
| Package depth | 142 mm |
| Package height | 504 mm |
| Package weight | 8.03 kg |
| Package type | Box |
| USB cable length | 1.8 m |
| Power cable length | 1.8 m |
| Cables included | AC, USB, DisplayPort |
| DisplayPort cable length | 1.8 m |
| Packaging content | |
| Power cable length | 1.8 m |
| Cables included | AC, USB, DisplayPort |
| DisplayPort cable length | 1.8 m |
| USB cable length | 1.8 m |
| Sustainability | |
| Sustainability certificates | ErP |
| Other features | |
| Packaging content | quick start guide, safety guide |
| User controls | picture adjust (contrast, brightness, overdrive, HDR, Adaptive Sync, night mode, blue light reducer, Motion Blur Reducer, gamma), input select (input source), audio adjust (volume, mute), store user setting (user modes), color settings (6-axis, color temperature, user preset, black tuner), image adjust (i-Style color, X-Res Technology, sharpness, HDMI range, direct drive mode, video mode adjust), language, setup menu (OSD horizontal position, OSD vertical position, OSD time, opening logo, power LED, DDC/CI control, usb charge), display information, reset (reset all) |
| Width | 557 mm |
| Weight | 5.3 kg |
| Height | 324 mm |
| Compliance certificates | CB, CE, EAC, PSE, REACH, RoHS, TÜV mark, VCCI, WEEE |
| Control panel | power switch, joystick, menu (center), up / signal select, down / shortcut, left / volume -, right / volume + |
| HDMI | Yes |
| Energy efficiency scale | A to G |
| Power supply type | Internal |
| Power cable length | 1.8 m |
| Touchscreen | No |
| Package type | Box |

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