Intel's USB 3.0 controller is faster than AMD's, too
 

Producing our Z77 motherboard round-up took more consecutive 12+ hour days than I'd care to admit. There simply wasn't enough time to squeeze in all the testing we wanted to do; most notably, the review lacked USB 3.0 performance numbers for the controller integrated into AMD's Llano platform. I've since run our USB 3.0 performance tests on an Asus F1A75-V Pro motherboard based on the AMD A75 chipset. This rig was equipped with an A8-3580 CPU and AMD's Catalyst 12.3 chipset drivers.

http://techreport.com/discussions.x/22775