How to change the speed on the RAM memory on my AN515-57-59HT

The Crucial ram module that you bought and have fitted as the 2nd ram module is the wrong CAS# Latency DDR4-3200MHz module that is why you are getting 2400 MHz speed in Task Manager. Have a look at the Crucial AN515-57 Acer Nitro AN515-57-59EY RAM & SSD Upgrades that are suggested and compatible with your laptop at that link.

To get 3200 MHz speed in Task Manager use this below 8GB Crucial ram module that has a CL22:

Crucial 8GB DDR4-3200 SODIMM - DDR4-3200 • CL=22 • NON-ECC • SODIMM • 260-pin • 1.2V • 2Rx8/1Rx8/1Rx16 • PC4-25600

This is a Nitro 5 AN515-57 with 2x DDR4-3200MHz CL22 type ram and what Task Manager shows:

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

If you want the fastest and max ram for your Nitro 5 AN515-57 model, then fit this 64GB KIT as Crucial pairs these ram modules together as a kit to work at their best together in your laptop and this is the most efficient ram that you can fit into your latop

This is the Crucial 64GB kit ram at CL22 DDR4-3200MHz which is the quickest and max capacity for your laptop:

'Crucial 64GB Kit (2x32GB) DDR4-3200 SODIMM - DDR4-3200 • CL=22 • NON-ECC • SODIMM • 260-pin • 1.2V • 2Rx8 • PC4-25600

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍