IBM System x3300 M4 Installation And Service Manual page 96

9. Press PCI-X riser-card assembly firmly into PCI slot 1
Attention: Incomplete insertion might cause damage to the system board or
the adapter.
10. Make sure the latch on the rear side of the PCI-X riser-card assembly is
secured to the rear of the server chassis.
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System x3300 M4 Type 7382: Installation and Service Guide