Dell XC Core Support Matrix XC450, XC650, XC750, XC750xa, XC6520, XC7525, XC4000r, XC4510c, XC4520c, and XC4000z Core

The XC4000r is a power module assembly that consists of two power distribution boards (PDB) and are connected to each other so either or both power supplies can power the entire chassis. The PDB at the bottom has chassis manager board to manage the chassis and the optional witness sled. The witness sled fan module is mounted on the PDB to help cool the witness sled. It also has two power interposer boards (PIB) that provide power to the sleds.