nPartition Administrator's Guide, Second Edition

A Superdome I/O expansion cabinet includes up to 3 I/O bays, with two 12-slot I/O chassis in
each bay. This provides for up to 6 chassis with a total of 72 PCI card slots in each I/O expansion
cabinet.
The Superdome I/O expansion cabinet is a standard-size cabinet that, space permitting, you can
mount peripherals in as well as I/O chassis.
Also refer to the book I/O Expansion Cabinet Guide for Superdome Servers.
60 nPartition Server Hardware Overview