Dell OptiPlex Gxi - Manual (Page 10)

Cache-Memory Card Removal (Mini Tower Chassis): OptiPlex GXi
1. Unlatch and rotate the power supply up until it locks.
2. Rock the cache memory card from side to side while pulling up on it.
Take note of which end of the cache memory card is the pin-1 end (nearest the right side of the system board).
When you replace the cache memory card, be sure the pin-1 end of the cache memory card (which has a "1" etched near the connector) is toward the right side of the
system board.