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IBM Power System E850C: Technical Overview and Introduction
2.7.2 PCIe logical connectivity
Figure 2-10 shows how the internal PCIe Gen3 adapter slots are connected logically to the
processor modules in the system. Each processor module supports two PCIe Gen3 x16 slots.
Processor module 0 also supports a single PCIe Gen3 x8 slot that is used for the default LAN
adapter. The other x8 connection is used by the RAID adapter in the system. Processor
module 1 supports two x8 slots connected through a PCIe Gen3 switch, along with the
internal USB 3.0 host adapter for the four USB ports on the server (two rear, two front).
Therefore, these adapters share the bandwidth of the x8 connection from the processor
module.
Figure 2-10 PCIe connectivity for the Power E850C server
A Power E850C server with fewer than four processor modules installed will not support all of
the PCIe slots inside the system enclosure. The third and fourth processor modules each
support two of the PCIe Gen3 x16 slots. Therefore, the maximum number of adapters
supported and the total PCIe bandwidth available varies by configuration.
All PCIe Gen3 slots in the server are hot-plug compatible for concurrent maintenance and
repair. These procedures should be initiated through the HMC or ASMI menus.
Where the number of PCIe adapters in a server is important, the Power E850C supports the
external PCIe Gen3 I/O expansion drawer (#EMX0). This drawer contains two Fan-Out
modules, each of which supports six PCIe adapter slots (four x8 slots and two x16 slots).
These Fan-Out modules connect through optical cables to a PCIe Optical Cable Adapter
(#EJ08) card, which is placed in a PCIe Gen3 x16 adapter slot in the server.
Each processor module in the Power E850C server supports up to two PCIe Optical Cable
Adapters, and therefore up to two Fan-Out modules. This configuration means that each
processor module can support up to one full PCIe Gen3 I/O expansion drawer, giving a total
of 12 PCIe Gen3 slots. All of the adapters that are connected to a Fan-Out module share the
bandwidth of the single x16 slot in the server. For more information about the PCIe Gen3 I/O
expansion drawer, see 2.11.1, “PCIe Gen3 I/O expansion drawer” on page 62.
Summary of Contents for E850C
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