Hey Keifer,

the CPU is very capable for the price asked for the whole system (35 bucks).

I think you would be able to squeeze maybe 100 MBit/s out of the mostly single-threaded Tor instance but that's it.

If you just want your own little private bridge or a small guard relay, go for it but if you want your relay to be usable at all times get a Pi 5 which has hardware AES acceleration, which can then be used by openssl (and then ultimately by Tor..).

Hope I could help,

-GH