IBM System x3550 M4 22I/O expansion optionsThe server supports two PCI slots with different riser cards installed into two riser sockets on the systemplanar (one riser socket supports the installation of one riser card). The slot form factors are as follows:Slot 1: PCIe x16; low profile, half-lengthSlot 2: PCIe x16, PCIe x8, or PCI-X; full-height, half-length (PCIe x16 slot requires second processorto be installed)Riser 1 supplies slot 1, and riser 2 supplies slot 2. All standard models except for model DDx have tworiser cards installed that provide one PCIe x16 Gen 3 slot and one PCIe x8 Gen 3 slot (features A1HJ andA1HK). Model DDx has two PCIe x16 slots (A1HJ and A1HL)You can replace the second riser card with one of the following (or configure one of these riser cardsinstead of the second riser card using special bid or CTO), provided a second processor is also installed:A riser with one PCIe x16 Gen 3 slot (69Y5671, feature A1HL)A riser with one PCIe x8 Gen 3 slot (69Y5670, feature A1HKA riser with one PCI-X 64 bit/133 MHz slot (69Y5669, feature A1HM)The following table lists the PCI riser card options.Table 11. PCI riser card optionsPart number FeaturecodeDescription MaximumsupportedModelswhere used94Y7585 A1HJ x3550 M4 PCIe Riser Card 1 (1 x16 LP Slot) 1 All models69Y5670 A1HK x3550 M4 PCIe Gen-III Riser Card 2 (1 x8 FH/HLSlot)1 All models exceptDDx69Y5671 A1HL x3550 M4 PCIe Gen-III Riser Card 2 (1 x16 FH/HLSlot)1 DDx69Y5669 A1HM x3550 M4 PCI-X Riser Card 2 (1 PCIX FH/HL Slot) 1 -Network adaptersThe x3550 M4 supports four integrated Gigabit Ethernet ports.Integrated NICs have the following features:An Intel I350AM4 chipFour GbE portsTCP Offload Engine (TOE) supportWake on LAN support802.1Q VLAN tagging supportNIC Teaming (load balancing and failover)Optionally, two 10 Gb Ethernet ports can be added by installing the a dual-port 10 Gb Ethernet mezzaninecard as listed in the following table. Mezzanine cards use a dedicated connector on the system board anddo not consume a PCI expansion slot.