The PCIe Gen3 x4 Ultra M.2 interface pushes data transfer speeds up to 32Gb/s. In addition, it also supports SATA3 6Gb/s M.2 modules, and is compatible with ASRock's U.2 Kit for installing some of the world's fastest U.2 PCIe Gen3 x4 SSDs. Supports the latest DDR4 memory modules and most extreme memory performance!
NOTE: Make sure to unplug the power cord before installing or removing the motherb oard components. Failure to do so may cause physical injuries and damages to motherboard components
Legacy USB Support- Enable or disable Legacy OS Support for USB 2.0 devices. If you encounter USB compatibility issues it is recommended to disable legacy USB support. Se lect UEFI Setup Only to support USB devices under the UEFI setup and Windows/Linux operating systems only.
Port 60/64 Emulation – Enable the support of I/O port 60h/64h emulation. his should be enabled for the complete USB keyboard legacy support for non-USB aware OS.
*Enable this option if you install Windows 7.