Dell OptiPlex Gxi - Manual (Page 75)

SIMM Removal and Installation: OptiPlex GXi
SIMM Removal | SIMM Installation
SIMM Removal
1. Push outward on the SIMM socket's tabs until the SIMM is released from its socket. It should pop forward slightly.
2. Lift the SIMM away from the socket.
SIMM Installation
To replace a SIMM, place the SIMM fully into the socket at an angle. Pivot the SIMM upward until the tabs lock the SIMM into the socket.