Tom's Hardware Guide published a review on Acer Predator XB271HK 27-inch UHD G-Sync Monitor
A quote from the article:
Gamers seeking Ultra HD resolution have few choices but an excellent new G-Sync monitor has just appeared from Acer, the XB271HK sporting a 27-inch AHVA screen. We?re checking it out in our lab today.Acer Predator XB271HK 27-inch UHD G-Sync Monitor Review @ Toms Hardware