I just OC'd this $90 Acer 29inch 4K monitor from Japan to 75HZ using DisplayPort. I'm about to get a 200hz monitor so this is temporary. I actually managed to get it
Asus ROG Swift PG32UQX: 4K-Mini-LED-Monitor mit 144 Hz, DisplayHDR 1400 und G-Sync Ultimate naht zum wahnsinnigen Preis - Notebookcheck.com News