1 x PCIe 4.0 x16 (PCIE1), supports x16 mode* 2 x PCIe 3.0 x1 (PCIE2 and PCIE3) *PCIE1 will run at Gen4x16 with 9000 and 7000 series CPUs, Gen4x8 with 8000 (Phoenix 1) series CPUs and Gen4x4 with 800