Chapter 3. Product information 89
As we show in the system block diagrams in 2.2, “System architecture” on page 19, the first
Optional I/O Book connects to the processor in Compute Book 3 and the second Optional I/O
Book connects to the processor in Compute Book 4. This bus connectivity results in the
following requirements:
In the x3850 X6, four Compute Books are required to use one or two Optional I/O Books.
In the x3950 X6, the use of two Optional I/O Books requires six Compute Books, and the
use of four Optional I/O Books requires all eight Compute Books.
3.13.1 Half-length I/O Book
The Half-length I/O Book provides three PCIe slots to the server:
Two PCIe 3.0 x8 slots (x8 wired)
One PCIe 3.0 x16 slot (x16 wired)
All slots support half-length full-height adapters (full-length adapters are not supported) and
the maximum power consumption for each PCIe slot is 75W. Figure 3-28 shows a top-down
view of the Half-length I/O Book.
Figure 3-28 Half-length I/O Book PCIe ports location
The Half-length I/O Book supports hot-swap PCIe adapters. See 3.14, “Hot-swap adapter
support” on page 91 for specifics.
3.13.2 Full-length I/O Book
The Full-length I/O Book provides three PCIe slots to the server:
Two PCIe 3.0 x16 (x16 wired)
One PCIe 2.0 x8 slot (x4 wired)
The Full-length I/O Book also includes two auxiliary power connectors. With the use of these
connectors and the supplied power cords, the I/O Book supports one double-wide adapter up
to 300W. Auxiliary power connectors are as follows:
One 2x4 power connector; supplies up to 150W additional power to the adapter
One 2x3 power connector; supplies up to 75W additional power to the adapter
The cables that connect to these auxiliary connectors are shipped with the Full-length I/O
Book.
PCIe 3.0 x16 slot (x16 wired)
(75W max power)
Two PCIe 3.0 x8 slot (x8 wired)
75W max power
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