On 7/3/11, Robert Heller <heller at deepsoft.com> wrote: > (I'm guessing that Google's massive array of battery powered servers use > things like Atom processors or some other mobile or embeded processing > elements on their custom motherboards, which might be a customized > variant of a laptop or embedded processing motherboard.) IIRC, Google's server boards run normal processors. It's just the board was customized to work off single+12V voltage, with a battery sitting in between to act as a UPS. The reason was a single +12V battery per server was cheaper than a huge UPS for a bunch of servers. Google also use enough boards that it was economically feasible for the manufacturer to make design changes to an existing board design to support this.