Dell PowerEdge FX2 and FX2s Enclosure Owner's Manual

Expansion bus refers to the PCIe connections between the compute sleds and the PowerEdge FX2s enclosure. The expansion bus supports PCIe mezzanine cards installed in the compute sleds. PowerEdge FX2s has two PCIe switches integrated on the PCIe switch board to connect the compute sleds to the eight low-profile PCIe expansion slots on the enclosure. Each half-width and quarter-width compute sled supports one PCIe mezzanine card. Each full-width compute sled supports two PCIe mezzanine cards.