Not all USB3 ports are created equal.
I have a friend who develops embedded hardware that interfaces with USB chipsets. He told me that most USB chipsets that are slightly faster than USB2 (480 Mbit/s) are labeled as USB3 even if they fall far short of the 5Gb/s theoretical limit.
I'd like to transfer uncompressed video over USB3. According to http://en.wikipedia.org/wiki/Uncompressed_video#Storage_and_Data_Rates_for_Uncompressed_Video 24bit @ 1080i @ 30fps requires 1.39Gbps. How do I measure the actual transfer speed supported by a USB3 port?
Most manufacturers don't mention the actual USB3 speed and I don't have anything to connect to the USB3 port that will transfer at speeds even close to the theoretical speed of 5Gbps. I will later on, when I get the live uncompressed video stream, but I'd like to test the USB3 port before buying this expensive video streaming equipment.