Compaq Armada M300 Series Reference Manual page 64

9. To add a memory board, insert the memory expansion board into the
empty memory expansion slot at a 45-degree angle . Then slide it
gently into place until it is seated while tilted.
NOTE: All memory expansion boards supported by the computer are keyed
(notched) to ensure correct positioning.
10. Push the memory expansion board down until the plastic retention clips
snap into place.
11. Replace the memory insulator, if applicable.
12. Replace the keyboard by gently pressing down on the top of the keyboard
until it clicks into place.
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