I own two SPARC servers (a 2003ish V245 and a 2007 T5120) and both are rather ridiculous ... idle power draw for a V245 is like 240 W and just 150-180 W of that are the fans. [1] A T5120 draws some 180 W idle as well. Especially the latter was also heavily marketed as green computing / efficient data centres / throughput computing. Completely ridiculous offering at the time.

Needless to say, I didn't even bother to set these up lest build a rack for them (my normal rack is both full and too short). If packaging weren't so annoying with computer servers I would've sold them long ago.

[1] The good stuff. High static pressure, high flow fans from Delta with ball-bearings, and of course only speed monitoring, no regulation. These Sun servers make for excellent magnet boards for holding papers just without using any magnets.