The SR630 server supports one LOM card slot and up to four PCIe slots: one slot on the system planar that is dedicated to an internal storage controller and up to three PCIe slots with different riser cards installed into two riser sockets on the system planar (one riser socket supports installation of one riser card).The slot form factors are as follows: LOM card slot Slot 1: PCIe 3.0 x8, ML2 x8, or ML2 x16; low profile Slot 2: PCIe 3.0 x16 or x8; low profile or full-height, half-length Slot 3: PCIe 3.0 x16; low profile Slot 4: PCIe 3.0 x8 (dedicated to an internal storage controller)Configuration notes: Slot 3 requires the second processor to be installed. Slots 1 and 2 are not present if the Rear HDD Kit is installed. The COM Port Upgrade Kit is installed in place of one of the PCIe slots 1, 2, or 3.