The PowerEdge M640 system supports two PCIe x8 Gen 3 slots mezzanine card supporting dual port 10 Gb Ethernet, quad port 1 Gb, FC8 Fibre Channel, FC16 Fibre Channel, or Infiniband mezzanine cards. The PowerEdge M640 system supports up to two 2.5-inch, hot-swappable SAS/SATA hard drives, SSDs, or PCIe NVMe drives.