Lenovo x3300 M4 7382 Installation And Service Manual page 72

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 Installation and Service Guide