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How to Find the Right 4K Monitor
These days, good 27-inch 4K monitors don’t cost much more than non 4K monitors with similar features. If you’re viewing or editing 4K resolution pictures or videos at native resolution, or even if you just want sharper text and images on your screen, a 4K monitor is worth the investment. However, if you're looking for a budget option, and you don't need to do any photo or video editing, 1440p or 1080p is perfectly acceptable for most use cases.
“4K” is a loose term that indicates the approximate number of pixels present horizontally across the screen; the actual 4K resolution is 3840 pixels by 2160 pixels. That’s four times the pixels in a 1080p display and 2.25 times as many as in a 2560×1440-pixel display. The pixel density in a 4K display allows for sharper, more detailed images and videos, as well as an increase in usable desktop space.
Your computer needs to support DisplayPort 1.2 or later or HDMI 2.0 or later; most things released in or after 2015 should display your desktop and apps at 60 Hz just fine, though your graphics processor and Internet connection will also determine whether games and streaming video can run at 60 Hz.