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.
Despite being provided with UASP-activating software support, the Asus X79-Deluxe motherboard's USB 3.0 ports operating from ASMedia's ASM1042 chipset aren't as fast as those found on the company's Z87 Maximus VI Formula. Fatigue on our ADATA SSD since testing the Maximus VI Formula could have a slight skewing effect on the data, however.
On the other hand, a motherboard that doesn't offer UASP support will limit its USB 3.0 ports' throughput speeds to around 200MB/s – a few Megabytes per second less than the throughput offered by ports on Asus' X79-Deluxe.