To answer my own question, and in case this information is useful to anyone else:
The USB ports appear to be 2.0:
usb1: EHCI version 1.0
usb1: <EHCI (generic) USB 2.0 controller> on ehci0
usb1: USB revision 2.0
Data transfer speeds to a 3.0 device overall showed higher throughput than to a 2.0 device, but not dramatically so. Regardless, total time to restore from a USB install image was identical whether using 2.0 or 3.0: 7 minutes 40 seconds.
|
USB2.0 |
USB3.0 |
fs copy from |
125.9Mb/s |
139.9Mb/s |
fs copy from (to /dev/null) |
128.5Mb/s |
170.2Mb/s |
fs copy to |
32.8Mb/s |
52.5Mb/s |
dd copy to |
35.0Mb/s |
112.4Mb/s |
boot & install from USB |
13.7Mb/s |
13.7Mb/s |