The xHCI driver will ship with Windows 8, letting you run USB 3.0 host controllers and compatible devices right out of installation. In sequential speed tests, variation between the two drivers seldom exceeded 2%.
In HDTune, the performance graph was smoother (fewer variations) with the Microsoft xHCI driver. The xHCI driver provided by Microsoft trailed a tiny/insignificant notch behind the third-party driver provided by Renesas. Tests included HDTune, ATTO, AS SSD, and CrystalDiskMark. The flash was put through four synthetic tests on a constant hardware setup, differences in performance were attributed to the drivers. The reviewer used Orico UE3 16GB USB 3.0 flash drive that uses SLC NAND flash memory. The controller is a μD720200F1 found on ASUS P8P67 Deluxe motherboard.
Expreview put this driver to test with a Renesas USB 3.0 controller, and compared its performance to when the controller is backed by Renesas' own driver (ver. With Windows 8, Microsoft is integrating an eXtensible Host Controller Interface (xHCI) driver, which serves as a common driver for USB 3.0 host controllers.
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