Comparing the transfer speeds of 2 different SD card types that I have in my bag. These were plugged into the internal SD reader on my rMBP - which is attached to the USB 3.0 bus, internally.

Comparing the transfer speeds of 2 different SD card types that I have in my bag. These were plugged into the internal SD reader on my rMBP - which is attached to the USB 3.0 bus, internally.