ACER XB280HK

Courtesy Acer

Acer XB280HK

A 4K monitor is great in theory, but extra pixels won’t really improve gaming if the screen can’t keep up with the computer’s graphics card. LCD monitors often have fixed refresh rates of either 60 or 120 Hz, but games rarely deliver frames at a constant speed, causing image tearing. The 28-inch Acer XB280HK is the first 4K monitor to include a Nvidia G-Sync board, which allows it to match rates on the fly with the computer’s graphics card. This way, dramatic battle scenes will always look the way developers intended. $799 Acer