Dell OptiPlex E1 - Manual (Page 50)

DIMM Removal and Installation (Mini Tower Chassis): Dell™ OptiPlex™ E1 Systems
DIMM Removal | DIMM Installation
DIMM Removal
To remove a DIMM from 1 of the 2 DIMM sockets, follow these steps:
1. Remove the system power supply.
2. Locate the DIMM you wish to remove.
3. Push outward on the DIMM socket's securing clips until the DIMM is released from its socket.
4. Lift the DIMM away from the socket.
DIMM Installation
1. Reinstall the replacement DIMM by pressing the DIMM fully into the socket while closing the securing clips to lock the DIMM into the socket.
2. Replace all assemblies and cables previously removed.