I have a dual tpu coral as well as a USB coral. The dual TPU is attached via an adapter so both TPU’s show. The USB Coral is plugged into a USB 3.2 As you can see from the attached image, there isnt a whole lot of speed difference between the two. Coral 3 is the USB. I just figure some people may be interested in this info…
Dual TPU:
Got mine off EBAY.
Adapter:
Dual Edge TPU Adapter - PCIe x1 Low Profile | Makerfabs?