https://www.techpowerup.com/253529/philips-unveils-the-displayhdr-600-rated-326m6vjrmb-ultra-hd-monitor Philips today unveiled the 326M6VJRMB, a 31.5-inch 4K Ultra HD monitor certified by VESA to meet DisplayHDR 600 standards. Backed by an AMVA panel, the monitor puts out 10bpc or 1.07 billion colors, 178°/178° viewing-angles, 4 ms response time, and 3,000:1 static contrast ratio with 600 cd/m² maximum brightness. I looked on the Philips website and it says the refresh rate is 60 hertz and a 4ms response time.