With its emergence as the new standard for high-speed portable devices, USB 3.0 performance on a modern motherboard needs to be good to ensure that data transferral bottlenecks aren't created.
We tested USB 3.0 performance using an ADATA SP300 SSD connected to an Icy Box IB-223StU3 USB 3.0 enclosure (ASMedia ASM1051 controller). ATTO was the benchmark used.
Using Asus' UASP-activating software called USB 3.0 Boost, the Maximus VI Hero is able to offer well over 250MB/s read speeds from an attached device, provided the drive is fast enough.