44-Lane CPU- 3 x PCIe 3.0/2.0 x16 (x16, x16/x16, x16/x16/x8) 2 x PCIe 3.0/2.0 x1 x1 28-Lane CPU- 2 x PCIe 3.0/2.0 x16 (x16, x16/x8) 1 x PCIe 3.0/2.0 x16 (x2 mode) x2 2 x PCIe 3.0/2.0 x1 x1