Dell Precision R5400 (Mid 2008) - Manual (Page 9)

Replacing an Expansion-Card Cage
1. Reconnect cables that attach to any expansion cards installed in the cage, if applicable.
2. Align the guides on each end of the expansion-card cage with the guide posts on the system board, and lower the cage.
3. Press the cage downward to seat the riser board into the riser board connector on the system board.
4. Press the blue release latches downward into the cage.
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NOTE: The outer expansion-card cage has two openings on one end for threading the power cables P5 and/or P6 if required for any installed
expansion cards.
NOTE: The center expansion-card cage has three guides for three posts on the system board, and the outer card cage has only two guides for
two posts on the system board.