Wow - I'll need to look at my main system (which does have much lower power usage than the big servers and SGI boxen)

It isn't going to be anywhere near that low :-)

(what did you use to get power figures?)
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock