ROG Swift OLED PG27UCDM | Gaming monitors｜ROG - Republic of Gamers｜ROG Global
rog.asus.com
ROG PG27UCDM is 27-inch 4K QD-OLED gaming monitor with 240Hz refresh rate, DP2.1, OLED Anti-Flicker 2.0 and OLED Care Pro features to reduce the risk of burn-in

Mac Retina displays are about 215DPI, but here was have a gaming monitor at 240hz, OLED at 166PPI, not bad at all!

Pixel Pitch 0.15525mm

only downside is brightness maxes out at 450cd

https://www.sven.de/dpi/