I/O expansion options
The server supports up to 11 PCIe slots plus dedicated Mezzanine LOM slot (12 total) as follows:
In the Storage Book (standard in all models): Two PCIe 3.0 x8 slots for supported internal RAID
controllers and SAS HBAs
In the Primary I/O Book (standard in all models):
Two PCIe 3.0 x16 slots (x16-wired), half length, full height, up to 75 W of power
One PCIe 3.0 x16 (x8-wired), half length, full height, up to 75 W of power
One mezzanine LOM 2 (ML2) slot for network adapters with the new ML2 form factor (PCIe
3.0 x8)
Two optional I/O Books, each with three slots, all full height. Optional I/O Books are enabled for hot-
swap.
The following figure shows the Primary I/O Book with the air baffle raised to show the internals.
Figure 8. Primary I/O Book
Optional I/O Books can be either of:
Half-length I/O Book:
Two PCIe 3.0 x8 slots (x8 wired)
One PCIe 3.0 x16 slot (x16 wired)
Full-length I/O Book:
Two PCIe 3.0 x16 (x16 wired)
One PCIe 2.0 x8 slot (x4 wired)
Hot-swap support
Lenovo System x3850 X6 (6241)
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