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Above: tidy cabling beneath the flooring of IBM's green datacentre allows air to move unimpeded.
IBM is also looking at other types of cooling: it is considering using a new type of fan developed by a partner which was developed for the military and delivers around 50 percent better performance, and around 30 percent better acoustics, according to Schmidt.
Acoustic performance is of growing importance, because of the sheer noise fans can generate - noise that could fall foul of workplace laws in Europe, for example.
More out-there technologies include the idea of dunking the IT equipment in a special fluid, Schmidt says: "There's talk in the industry of dipping the whole system in baths of dialectric fluids. We have several projects in the lab looking at them."