The new ViewSonic VX2720-4K-PRO gaming monitor offers its 4K 144Hz over not one, but two HDMI 2.1 ports on the monitor. HDR duties aren't so great, with ViewSonic offering VESA DisplayHDR 400 ...
I tested (and gamed on) the 27-inch dual-refresh rate display and think it's reasonable choice -- if you get it at a reasonable price.
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