alt Hacker NewsMaybe 75 W without disk is not terrible but it's not good. My unoptimized ARM servers idle at about 3 or 4 W and add another 1 or 10 W when their SSDs or HDDs are switched on.
75 W probably need active cooling. 4 W do not.
Anyway you can probably do many more things with that 75 W server.
A raspberry pi will go even lower. But as you say, not really comparable in term of functionality. I am comparing this to high end consumer NAS, which will idle at 30-40w minimum.