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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.
If they don't provide the actual speeds in their specs and you can't convince someone else who owns the hardware to test for you, you can't know in advance (prior to buying the component) the speed. It also depends on the protocol and how much overheard it is and how sensitive to latency it is (low chattiness + low overhead = high throughput). You'll get different overheads for UASP (low or no overhead), UAS (very low overhead), Mass Storage Bulk Only Transport (medium overhead), or a networking protocol like SMB over TCP/IP (very high overhead) or FTP over TCP/IP (high overhead). – allquixotic – 2013-03-15T18:06:20.927
USB3 150-300MB/s(1200-2400Mbit/s) maximum, depending on the controller – STTR – 2013-03-15T18:13:36.770