4K 144Hz monitors experience loss of image quality
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Asus PG27UQ and Acer X27 are the first monitors to hit the market with a panel at a speed of 144 Hz and high 4K resolution. These are monitors whose price exceeds 2, 000 euros, and which also have serious limitations in the representation of colors when they operate at their maximum refresh rate.
DisplayPort 1.4 does not have enough bandwidth to support a 4K image at 144 Hz
Users of these Asus PG27UQ and Acer X27 monitors have reported noticeable degradation in image quality when these monitors operate at 144 Hz, which is not the case when operating at 120 Hz. The reason for this is in their interface. DisplayPort 1.4 connection, which provides 26 Gb / s of bandwidth, enough for 4K at 120 Hz but it falls short to reach 144 Hz. In this situation, manufacturers had to find a solution in the form of chrominance subsampling (YCbCr) that, in the case of these monitors, transmits the grayscale portion of the image at full resolution (3840 × 2160) and the information color at half the horizontal resolution (1920 × 2160).
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This approach is called 4: 2: 2 and works especially well for the movie industry, but for computer-generated content such as text and the operating system interface, chrominance subsampling has a serious effect on quality., especially the readability of the text, so it is not used at all. In games, chrominance subsampling can be an acceptable approach, with negligible effects on 3D game quality and a slight loss of sharpness for the HUD.
Considering that gamers have been demanding 144 Hz on their 4K monitors for quite some time, and Nvidia has been pushing for it as well, it's no wonder that monitor vendors have accepted this compromise. The problem is that they have been completely silent about it and make no mention in their specification documents.
Given the small difference between games at 120 Hz and 144 Hz, the best approach to obtain the best visual quality is to run these monitors at 120 Hz, thus avoiding any loss of quality.
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