Dell PowerEdge VRTX Enclosure Owner's Manual

I/O module and PCIe mezzanine card configuration guidelines

Fabric A supports an Ethernet switch or a pass-through module.
To enable switch configuration before imaging the server modules, the I/O module must be allowed to power-up before the server modules are turned on.
Each half-height server module installed in the PowerEdge VRTX enclosure supports two PCIe mezzanine cards in Fabric B and Fabric C slots. Each full-height server module supports four PCIe mezzanine cards in the two Fabric B and two Fabric C slots. To locate the Fabric B and Fabric C slots, see the server module Owner's Manual at Dell.com/poweredgemanuals. The PCIe mezzanine cards are mapped to the PCIe expansion slots on the enclosure. For more information, see Mapping PCIe Expansion Slots.
NOTE: Only PCIe mezzanine cards can be installed in Fabrics B and C of the server modules. Non-PCIe mezzanine cards such as Ethernet, Fibre Channel, or InfiniBand mezzanine cards are not supported. If you install non-PCIe mezzanine cards on the server modules, an error message is displayed on the LCD screen of the enclosure.
NOTE: Single PCIe mezzanine card operation is not supported.