[scottlamb]

You can get that better device by attaching the $60 Coral USB Accelerator to one of the Raspberry Pi 4's USB3 ports. You can even install more than one USB Accelerator per host machine if you want. (But if you go far down that line maybe you should get a nVidia Jetson board instead.)

I don't know why the Coral folks bother with the dev boards; I think their USB accelerators and M.2 cards are better buys. The Pi4 + USB accelerator + a SD card costs roughly the same as this dev board and is more powerful with better community support.

I'm hoping they release a newer, faster version of the Edge TPU itself. There are some newer, faster AI accelerators from other vendors (the Gyrfalcon Lightspeeur 2803S, the Hailo-8) but the Coral USB Accelerator is reasonably priced, actually available to hobbyists, (as of recently) has open-source driver for TensorFlow, etc.

Note: I work for Google, but I don't have any inside knowledge about Coral.