Asus PN61 Serie Manuel De L'utilisateur page 30

Installing memory modules
Your Mini PC comes with two SO-DIMM memory slots that allow you to
install two DDR4 SO-DIMMs.
IMPORTANT! Refer to http://www.asus.com for the list of compatible
DIMMs. You can only install DDR4 SO-DIMMs to the Mini PC's DIMM
slots.
1. Align and insert the memory module into the slot (A) and press it
down (B) until it is securely seated in place. Repeat the same steps to
install the other memory module.
30 PN61 Series