I believe the highest ram speed/frequency on the AN517-52-78NA is 3200mhz, I bought some Crucial Ballistix DDR4 16GB RAM (8GBx2) 3200mhz:
Crucial Ballistix BL2K8G32C16S4B 3200 MHz, DDR4, DRAM, Laptop Gaming Memory Kit, 16GB (8GB x2), CL16, Black - Crucial (amazon.co.uk)I installed the new RAM into my computer and it went well with nothing bad happening, then after I go into the task manager to see the speed/frequency and it says its running at 2667mhz, I looked around everywhere to see how to change the speed/frequency and people on YouTube said to go into the BIOS and enable xmp, but I looked for that and nothing came up. Does anyone know how to change the speed/frequency to 3200mhz if its possible? Thanks