z77 slot32GB. Expansion Slots. PCI Slots, 1 xPCI Express 3.0 *2.0 x16 slot (x16 mode) 1 xPCI Express 2.0 x16 slot (maximum x4 mode, compatible withWith PCIe 3.0 slots and multiple SATA ports, the motherboard can accommodate the latest storage solutions and expansion cards. The robust power delivery system