The server supports low-profile I/O cards mounted in PCIe hot-plug carriers. The server supports the PCIe 8-lane format.
I/O card slots connect to root complexes in CMPs that are mounted on CMUs. The I/O paths include I/O switch boards in I/O card cages. For more information on root complexes and redundant paths, refer to Server Administration, understanding PCIe device root complexes.