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/Memory-in-the-Acer-Predator-Helios-300-PH315-53-runs-in-single-channel-mode.501701.0.html
I have the same laptop and I checked in Task Manager, it says that 2 out of 2 RAM slots are occupied.