The Predator Helios 300 brings all modern computer games smoothly onto the matte screen (Full HD, IPS, 144 Hz). Since Acer only uses one RAM module, memory runs in single-channel mode.
https://www.notebookcheck.net/Acer-Predator-Helios-300-PH315-53-in-review-Fast-gaming-machine-with-extra-performance.501561.0.html
This one, Games not good, Memory 16gb, battery 56w, it is for design ok
Be aware, that most of the PH315-53 series laptop are equipped with either CMN1521 (RTX2060, most likely all GTX series card) or NCP004D (RTX2070 max-q). Both of them are 250nit display with awful screen bleeding, 45% NTSC and 60% sRGB coverage. I haven't heard of 300nit displays from real buyers, only in the reviews ( so basically Acer gives top model to reviewers) or at least this is the case in Europe. This is for 144Hz display. I don't have any information for the 240Hz options.