Acer has pipped their competition at the post by announcing an update to the Predator Triton 500, making it the first laptop revealed with a 300 Hz display. Acer is also showing off the Predator Triton 300, which aims to provide a balanced laptop for those who still want to game in their downtime.
https://www.notebookcheck.net/Acer-Predator-Triton-500-is-the-first-laptop-announced-with-a-300-Hz-display.434149.0.html