Dell OptiPlex Gxi - Manual (Page 8)

Cache-Memory Card Removal (Midsize Chassis): OptiPlex GXi
To remove the cache memory card, 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.