Looking at the core feature set, the MSI MEG X570 Unify includes three PCIe 4.0 x4 M. ... There are three full-length PCIe 4.0 slots which operate at x16, x8/x8, and x8/x8/x4, as well as two PCIe 4.0 x1 slots. Supported memory speeds allow for DDR4-4600 and up to 128 GB to be installed.