https://www.asus.com/tw/Motherboards/MAXIMUS_VII_HERO/specifications/ *1: The PCIe 2.0 x16 slot (PCIEX4_3) shares bandwith with PCIe 2.0 x1 and M.2 slot. The default setting is Auto Mode, which automatically optimizes the system bandwidth. If you install a PCIe 2.0 x4 device, the system will automatically detect and disable PCIe 2.0 x1 and M.2 slot.