The Samsung U28E590D is a great choice if you are looking for an affordable 4K monitor with Freesync. Despite its low price, it has great display specs that can compete with more expensive monitors, quick response times and multiple connection options.
Pro Great picture quality
The Samsung uses a 10-bit color display panel, resulting fantastic picture quality. It can reproduce more than a billion colors, compared to the 16 million colors of 8-bit panels. The color saturation and accuracy easily compete with more expensive screens, although they are not precise enough for photo-centric work. Contrast levels are average, but the monitor is brighter than other monitors in its price group.
Pro Multiple inputs (and the option to watch them simultaneously)
This screen's connectivity consists of two HDMI 2.0 ports and one DisplayPort 1.2., which is enough for most users. Samsung offers picture-in-picture and picture-by-picture modes. Meaning that you can view two inputs side by side or one can be scaled down to a small window that you can place on one of the corners.
Pro Good colors
The screen’s 10-bit panel covers 97% of the sRGB color spectrum which is a respectable result for a budget monitor. For professional use, you will have to look for something more accurate. Color saturation and accuracy is excellent and can compete with higher priced models.
Con Extremely limited Freesync range (54-64hz)
The Freesync feature is almost useless as the range is actually 54-64hz instead of at least 40-60hz.
And no, even using CRU won't help, as any modification to the freesync range will result into the monitor turning complete white (stuck) eventually after awhile.