The best gaming monitors for playing at 4K are Acer's Predator X27 and Predator XB321HK, but if you're looking for something more affordable, check out LG's 24UD58-B. The name is boring compared to something called a "Predator," but it's on sale today for $229.99.
LG's monitor sports a 23.8-inch IPS panel with a native 3840x2160 resolution, and supports FreeSync to boot. It lacks bells and whistles such as HDR support and a built-in USB hub, but for the price, it's hard to complain.
LG 24UD58-B Monitor | 4K | FreeSync | $229.99 (save $120)
If you have the graphics horsepower to push 4K gaming, this monitor will oblige. It supports FreeSync, too. Use coupon EMCSTVVU3 for the full discount. Buy at Newegg
Connectivity options include a DisplayPort 1.2 input and two HDMI 2.0 inputs. It also supports LG's Split Screen tech with 14 options, including four different picture-in-picture choices.
You'll need to use coupon code EMCSTVVU3 at checkout to get the full discount.
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