IBM 7383 Installation And Service Manual page 86

6. Remove the expansion-slot cover kit in PCI slot 1 and save it for future use.
7. Press the PCI-X bracket firmly into PCI slot 1.
8. Make sure the latch on the side of the PCI-X bracket is secured to the rear of
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System x3500 M4 Type 7383: Installation and Service Guide
Attention: Incomplete insertion might cause damage to the system board or
the adapter.
the server chassis.