With a 4K monitor, you get crisp and clear text and images unlike in lower resolutions. Texts are noticeably sharper, just like when you look at your smartphones with HD display. In gaming, there is a noticeable improvement in visual fidelity and sharpness of the image. It's simply on a new level compared to a 1080p or 1440p monitor. On the flip side, a 4K resolution has 4x more pixels than a 1080p resolution or around 3x more pixels than 1440p. This means you need a fairly powerful graphics card to drive all those pixels and push all those frames especially when gaming. While many modern graphics cards can technically be used with a 4K resolution, gaming at 4K is a different story.