HP ZE4900 - Manual (Page 94)

Removal and Replacement Procedures
Maintenance and Service Guide 5–11
5. Spread the 2 retaining tabs 1 that secure the memory module
to the memory module socket. (The module rises up).
6. Remove the memory module by pulling it away from the
memory module socket at a 45-degree angle 2.
Removing a Memory Module
Reverse the above procedure to install a memory module.