An anonymous reader writes "Anandtech compares the Boston Viridis, a server with Calxeda's ARM server technology, with the typical Intel Xeon technology in a server environment. Turns out that the Quad ARM A9 chip has it weaknesses, but it can offer an amazing performance per Watt ratio in some applications. Anandtech tests bandwidth, compression, decompression, building/compiling and a hosted web environment on top of Ubuntu 12.10."
At least in their tests (highly parallel, lightweight file serving), the ARM nodes offered slightly better throughput at lower power use
, although from the looks of it you'd just be giving money to the server manufacturer instead of the power company.