"Bitaxe is a fully open source hardware Bitcoin ASIC miner. Ultra is the 3rd major revision of the bitaxe that now includes the BM1366 ASIC from the S19XP."
"v1 hardware has been built, and it does mine! Quite well actually. Be sure to check the issues for known bugs, reworks and errata."
"This is an advanced build! It's also still early days, so prolly not the best thing if you're just looking for a bitcoin miner to run."
"The bitaxeUltra (BM1366, S19XP) has a slightly higher hashrate and better efficiency. Under the hood there are several improvements that make this a much more extensible ASIC to design with. But it does cost more than the bitaxeMax (BM1397, S17)."
Standalone: can mine directly to your pool over WiFi. No External computer needed.
Embedded: low cost, low maintenance, high availability, high reliability, low power.
ASIC: based on the very, very efficient BM1366 from Bitmain.