Lenovo Flex System x240 Instruction Manual page 28

The following figure shows how two-port adapters are connected to switches installed in the chassis.
Figure 9. Logical layout of the interconnects between I/O adapters and I/O modules
Flex System PCIe Expansion Node
The x240 supports the attachment of the Flex System PCIe Expansion Node. The Flex System PCIe
Expansion Node provides the ability to attach additional PCI Express cards such as High IOPS SSD
adatpers, fabric mezzanine cards, and next-generation graphics processing units (GPU) to supported
Flex System compute nodes. This capability is ideal for many applications that require high performance
I/O, special telecommunications network interfaces, or hardware acceleration using a PCI Express card.
The PCIe Expansion Node supports up to four PCIe 2.0 adapters and two additional Flex System
expansion adapters.
Flex System x240 Compute Node (E5-2600 v2) 28