HP EliteDesk 800 Hardware Reference Manual page 24

7. Locate the memory modules on the system board.
8. To remove a memory module, press outward on the latches (1) on each side of the memory module, and
then pull the memory module (2) out of the slot.
9. Slide the new memory module (1) into the slot at approximately a 30° angle, and press the memory
module down (2) so that the latches lock it in place.
NOTE:
on the memory module slot.
18 Chapter 3 Hardware upgrades
A memory module can be installed in only one way. Match the notch on the module with the tab