There are three external and one internal PCIe slots available. The external slots support optional, standard PCIe cards and are numbered 1, 2, and 3 from left to right when you view the server from the rear. The internal slot, which installs on the riser in PCIe slot 3 and 4, supports a required internal SAS controller HBA card. For a view of the rear panel that shows PCIe slot numbering, see Server Back Panel View.
Note - PCIe slot 1 is nonfunctional in single-processor systems.
Note - All of the PCIe slots comply with the PCI Express 3.0 specification and can accommodate 25 watt PCIe cards.
The following table lists the characteristics and requirements of the PCIe slots.