Was looking at the energy report from Apple, regarding their MacBook and MacBook Pro models. It turns out a power adapter working at 100V consumes less power (in terms of Watt) than the same adapter (presumably) working at 230V. This happens in all situations from "computer off" (0.25W vs. 0.27V) to "display on" (12.2W vs. 12.4W). On the other hand the efficiency is higher for the higher voltage range (due to the higher ratio of voltage downgrading I suppose), and in general very high for the Macs (close to 90% in both cases).
While 100/115V wins here I think the transmission is more efficient with a higher voltage (might be wrong here...), so the way from the substation to the power socket is in favour of the 230V voltage. Of course a thousand other factors affect in actual practice the real efficiency and with it ultimately power consumption of our PCs.
(cool thing I remember seeing: A version of google "in black", which is supposed to make our screen save energy by displaying darker pixels)
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