The NBP 2U220 is a 2U (butterfly) backplane with 1 x SHB, 2 x PCI slots, 1 x PCIe x4 and 1 x PCIe x16. The NBP 2U220 PICMG 1.3 backplane supports 1 PCIe x16 and 1 x full-sized PCIe x4 Lane.