Just wanted to share my testing results from the past two days with my R606 powered by an HP1200. Running on a Raspberry Pi 3B+ over wifi, so it looks like I'm maxxed out on this config as 600MHz is autotuning to 588. Might try an ASUS Tinker Board since that has a little more horsepower. I really want to keep this setup as mobile as possible. Still need to run a cable to where I have this sitting, so I haven't tried a hardwired network connection yet.
V4 550MHz - whole setup is drawing 102W at the wall (if you trust my Wemo Insight switch):
https://imgur.com/a/0nb1vWfV4 600MHz - drawing 107W at the wall:
https://imgur.com/a/QVnpGaV