HP Armada 7300 Reference Manual page 96

4. Turn the computer upside down.
5. Remove the two screws from the memory compartment
cover .
The tamper-resistant screws supplied with the computer
NOTE:
have a post in the middle of the screw head. Only the
screwdriver supplied with the computer removes those screws.
A Torx T-8 screwdriver removes the factory-installed screws.
6. Slide and lift the memory compartment cover to remove it
Removing the Memory Compartment Cover
Upgrading RAM Memory 12-3
.