I wonder how much of this is a result of people trying out the Windows 7 RC?
6 publicly visible posts • joined 23 Sep 2008
And hence Google's request for chips that can run +5 degrees...
From a cooling perspective a chip with a 100W/70C heat load needs to be cooled at least to about 50 Celsius above ambient. This puts the thermal resistance to ambient required for cooling at 21C (70F) at 0.5 c/W. If Google simply used better heatsinks they can get this down to 0.4 c/W which means the same chip at 70C dumping to 27C (80F). Achieving 0.4 c/W is not that big or a problem. Bulky desktop heatsinks approach 0.1 c/W.
However just sticking servers in an air conditioned room (box) isn't an efficient way to cool. Hot and cold corridors only work if you limit mixing to the heatsinks.