The Iiyama G-Master GB2590HSU-B1 screen opted for a very classic design with well-crafted matte black plastics. Only the Y foot is slightly more original than the rectangular foot of other Japanese brand screens and allows you to see the side playing games this screen.
The Y-leg is relatively wide (50 cm for a depth of 25.6 cm). Fortunately, its branches are quite thin and free up a lot of space on the table.
This monitor offers height adjustment over 13 cm and tilt between -3 ° and + 18 °. The G-Master GB2590HSU-B1 also has a swivel joint for switching to portrait mode.
The back of the chassis is made entirely of high-quality grained matt black plastic. The connector is facing down. The screen is compatible with 100 x 100 mm VESA mounts once the stand is removed. At the base of the arm there is also a relatively basic cable passage, which allows you to group all the wires.
The connection consists of HDMI input, DisplayPort input, headphone output and USB 3.0 ports. The screen also has two 2W speakers, which are far from exceptional, but also help with system sounds and watching short videos.
Navigating the On-Screen Display (OSD) menus is performed using the five buttons located on the edge of the screen. They are not very practical, they generate relatively frequent handling errors. Too bad the manufacturer didn’t choose the joystick, as it does for some of its models (Iiyama ProLite XB3288UHSU-B1 for example).
The Iiyama GB2590HSU-B1 is very comfortable on our 140 x 60 cm table. The foot is not particularly compact, as the 25.6 cm deep monitor occupies a large part of the table. However, its vented side leaves enough space for a keyboard and mouse to install. The Full HD resolution of 1920 x 1080 pixels on this 25-inch panel results in a very average resolution of 88 pixels per inch (ppi). Full HD resolution of 1920 x 1080 pixels is excellent for games, especially at 240 Hz – a frequency that already requires a powerful graphics card. For other tasks, such as office automation or even Internet browsing, this definition remains very limited.
Colors and contrast
Immediately after unpacking, the Iiyama G-Master GB2590HSU-B1 monitor is already very well calibrated. With an average Delta E of 2.4, colors can be considered true to those emitted by the source, with gray levels reproduced perfectly thanks to an average gamma measured at 2.2 and a perfectly stable curve across the spectrum. The same observation on the color temperature side, the average of which is measured at 6380 K, is very close to the reference value (6500 K), while showing perfect stability in the whole spectrum. By lowering the brightness to 20 to get a white near 150 cd / m2, the picture quality remains almost unchanged, with gamma dropping very slightly to 2.1, with no real impact on gray level reproduction. Probe calibration using the probe allows you to display perfect colors, especially at the levels of red, green, blue and yellow, which fall below Delta E 2. Gamma curves and temperature are perfectly stabilized. You can download colorimetric profile by clicking this link.
The native contrast of 1170: 1 is a bit behind the measured Asus TUF Gaming VG27AQ andAOC 27G2U, in both cases greater than 1200: 1. This contrast remains very good for the IPS panel. In any case, this monitor stays far from the contrast that is highlighted by the best VA monitors on the market, such as MSI Optix MAG271CR Where Philips BDM4037UW, whose contrast ratio exceeds 4000: 1. In practice, this means washed blacks in a darkened room. It is much less noticeable during the day.
The average deviation of white homogeneity is good. We measured it at just 8% on a 25-inch panel. So there is no difference in brightness perceptible to the eye. We did not notice any leaks of light around the corners, nor any turbidity (“cloud effect”) on our test model. IPS technology also offers good viewing angles with very small deviations when the user is no longer in front of the screen.
Iiyama G-Master GB2590HSU-B1 does not use pulse width modulation (PWM, Pulse width modulation) to adjust the brightness; therefore, it is flicker-free and does not cause headaches to those who are sensitive to this phenomenon. Iiyama also offers a blue light reduction mode in the software via the OSD.
This monitor handles FreeSync (and G-Sync extensions) between 40 and 240 Hz, so it works best when the graphics card sends between 40 and 240 frames per second. To take full advantage of this monitor, you need a fairly powerful graphics card, especially to be able to display 240 frames per second in Full HD. Graphics card such as GeForce RTX 3060 or Radeon RX6600XT seems minimal. You can even opt for higher performance models for the most demanding games. In all cases, there is fluidity and the image does not suffer from tearing problems (tearing) or idiots (microstuttering).
We measured the afterglow time at 7 ms with the overdrive (French for “response time” in the OSD) set to 4. At a maximum setting of 5, we notice a slight effect reverse spirit. Iiyama G-Master is not one of the most sensitive monitors on the market since Samsung Odyssey G7 27 Inch and G9 49 inches Equipped with a 240 Hz VA panel, it displays an afterglow time of 4.5 ms, but its IPS panel offers wider angles. However,Asus VG279QM, with a 27-inch Full HD IPS panel at 280 Hz, it also performs better with an afterglow time of just 4.5 ms. The display delay measured at 11.6 ms (at 60 Hz) results in almost zero delay between the action performed by the mouse or keyboard and its impact on the screen.