On paper, the Nixeus NX-EDG274K looks like one of the best FreeSync monitors around.

The Nixeus EDG27 was one of the best early 1440p FreeSync monitors you could buy, and at CES 2020, the company’s building on that foundation. The newly revealed Nixeus EDG274K is all that and more: a 4K, 144Hz AHVA display (read: IPS-like) with a bright screen blazing at 350 nits (or 400 in HDR mode), complemented by a stark 1000:1 native contrast ratio. Better yet, the monitor comes with AMD’s gameplay-smoothing, tear- and stutter-eradicating FreeSync built in.
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https://www.pcworld.com/article/3512960/4k-144hz-nixeus-nx-edg274k-freesync-monitor-dsc.html