i am fairly certain i have an AMD geode device and while it is tiny (4x3x1.5 inches), it certainly isn't low power, compared to a rapsberry pi or an intel quark.

also those vortex86 are pricey, around the same price as a NUC, at least for the daughtercards, and none really looked "general purpose" although i guess a daughtercard with a computer on it was not unprecedented. apple and amiga both had such. i think apple even did apple on apple before anyone else considered if this was a good idea