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

The XC4000z power module assembly consists of two power distribution board (PDB's) and are connected to each other so either or both power supplies can power the whole chassis. The power distribution board (PDB) at the bottom also has chassis manager board to manage the chassis and the optional witness sled. The witness sled fan module is mounted on the PDB which helps in cooling the witness sled. It also has one power interpose board (PIB) which provide power to the sleds.