iiyama G-MASTER GB2591HSU-B1 25″ 320Hz Monitor

25 inch · 1920 x 1080 · 320 Hz · Fast IPS

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Screen size 25 inch
Resolution 1920 x 1080
Refresh rate 320 Hz
Panel Fast IPS
Response time 0.4 ms

iiyama G-MASTER GB2591HSU-B1 25″ 320Hz Monitor is a 25-inch monitor with 1920 x 1080 resolution, a 320 Hz refresh rate and Fast IPS panel. The high refresh rate makes fast games look smoother. It came out in 2026.

Released: 2026-01-16

Specifications

Key specs

Screen size: 25 inch
Resolution: 1920 x 1080
Refresh rate: 320 Hz
Panel: Fast IPS
Response time: 0.4 ms
Released: 2026-01-16
Part number: GB2591HSU-B1
EAN / UPC: 4948570125562

Display

Display diagonal: 62.2 cm (24.5")
Display resolution: 1920 x 1080 pixels
HD type: Full HD
Native aspect ratio: 16:9
Display technology: LED
Panel type: Fast IPS
Display brightness (typical): 350 cd/m²
Response time: 0.4 ms
Response time (MPRT): 0.4 ms
Display surface: Matt
Screen shape: Flat
Contrast ratio (typical): 1000:1
Contrast ratio (dynamic): 100000000:1
Maximum refresh rate: 320 Hz
Viewing angle, horizontal: 178°
Viewing angle, vertical: 178°
Display number of colours: 16.7 million colours
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 diagonal (metric): 62 cm
High Dynamic Range (HDR) supported: Yes
High Dynamic Range (HDR) technology: High Dynamic Range 10 (HDR10)
Colour depth: 8 bit

Performance

NVIDIA G-SYNC: Yes
NVIDIA G-SYNC type: G-SYNC
AMD FreeSync: Yes
VESA Adaptive Sync support: Yes
Flicker-free technology: Yes
Low Blue Light technology: Yes

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Multimedia

Number of speakers: 2
RMS rated power: 8 W
Built-in speaker(s): Yes

Design

Market positioning: Gaming
Product colour: Black

Ports & interfaces

Built-in USB hub: Yes
USB hub version: 3.2 Gen 1 (3.1 Gen 1)
Number of downstream ports: 4
HDMI: Yes
HDMI ports quantity: 2
HDMI version: 2.1
DisplayPorts quantity: 1
DisplayPort version: 1.4
Headphone out: Yes
HDCP: Yes

Ergonomics

VESA mounting: Yes
Panel mounting interface: 100 x 100 mm
Wall mountable: Yes
Cable management: Yes
Cable lock slot: Yes
Cable lock slot type: Kensington
Height adjustment: Yes
Adjustable height (max): 15 cm
Pivot: Yes
Pivot angle: 0 - 90°
Swivelling: Yes
Swivel angle range: -45 - 45°
Tilt adjustment: Yes
Tilt angle range: 5 - 23°
On Screen Display (OSD): Yes
On Screen Display (OSD) languages: Czech, German, English, French, Italian, Japanese, Dutch, Polish, Portuguese, Russian

Power

Energy efficiency class (SDR): E
Energy efficiency class (HDR): G
Energy consumption (SDR) per 1000 hours: 18.4 kWh
Energy consumption (HDR) per 1000 hours: 31 kWh
Power consumption (typical): 30 W
Power consumption (standby): 0.3 W
Power consumption (off): 0.3 W
AC input voltage: 100 - 240 V
AC input frequency: 50/60 Hz
Power supply type: Internal
Energy efficiency scale: A to G

Weight & dimensions

Width (with stand): 557 mm
Depth (with stand): 55.5 mm
Height (with stand): 324 mm
Weight (with stand): 5.3 kg

Other features

Packaging content: quick start guide, safety guide
Weight: 5.3 kg
Height: 324 mm
Width: 557 mm
Control panel: power switch, joystick, menu (center), up / signal select, down / shortcut, left / volume -, right / volume +
Compliance certificates: CB, CE, EAC, PSE, REACH, RoHS, TÜV mark, VCCI, WEEE

Technical details

Native refresh rate: 60 Hz

Check the manufacturer's page before buying.

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About this product

The G-Master GB2591HSU-B1 is crafted to help you unleash your full gaming potential. With G-Sync Compatibility for smooth, tear-free gameplay and a 320Hz refresh rate, every movement feels fast and fluid. The 24.5” Fast IPS panel delivers clear, sharp visuals, while the 0.4ms response ensures you stay ahead in every game, without ever being held back by your gear. For added ergonomic comfort, the monitor includes a 150mm height-adjustable stand to fit your setup perfectly.

User manual (PDF) · Datasheet (PDF)

GB2591HSU-B1 vs similar monitors

	iiyama G-MASTER GB2591HSU-B1 25″ 320Hz Monitor	Acer XB253Q F3 Widescreen Gaming LCD Monitor	AOC G3 25G3Z/69 25″ 240Hz Monitor	ASUS TUF Gaming VG27AQM5F 27″ 320Hz Monitor
Screen size	25 inch	25 inch	25 inch	27 inch
Resolution	1920 x 1080	1920 x 1080	1920 x 1080	2560 x 1440
Refresh rate	320 Hz	320 Hz	240 Hz	320 Hz
Panel	Fast IPS	TFT	Fast IPS	Fast IPS
Response time	0.4 ms	0.5 ms	1 ms	0.3 ms
Released	2026	2026	2026	2026