You can increase the RAM from 8 GB to 16 GB, as this model has 8 GB soldered and an additional slot for another RAM module. This means you can install another 8 GB module to get a total of 16 GB RAM.

The compatible RAM type is DDR4 3200 MHz SO-DIMM (PC4-25600 Non-ECC). For the best performance, you should buy a module with these specifications. You can find suitable RAM modules at specialised retailers that offer DDR4 3200 MHz SO-DIMM for ASUS laptops.

To summarise:
- 8 GB are permanently soldered.
- There is a free slot for an additional 8 GB DDR4 3200 MHz SO-DIMM module.
- A maximum of 40 GB RAM is possible, but an additional 8 GB module is sufficient for 16 GB.
- Buy DDR4 3200 MHz SO-DIMM RAM, ideally from well-known brands and with ASUS compatibility.

This will help you find the right RAM modules: Search for DDR4 3200 MHz SO-DIMM modules for your model at specialised RAM retailers or ASUS-certified suppliers.