Dell OptiPlex NX1 - Manual (Page 85)

Removing and Replacing Parts on the Low-Profile Chassis 4-15
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To remove the riser board, follow these steps:
1. Remove the expansion-card cage and all expansion cards.
2. Lay the expansion-card cage on a flat work surface, with the riser board
facing up.
3. Remove the two riser-board mounting screws.
4. Lift the riser board away from the expansion-card cage.
When you replace the riser board, be sure that the alignment feature on the
expansion-card cage engages with the alignment slot.
riser board
riser-board mounting
screws (2)
expansion-card cage
riser-board
alignment slot