Over the last decade we have witnessed a succession of increasingly power
inefficient CPU designs. In this article we examine some economic aspects of
building a large scale computing infrastructure, and how such power trends, if
continued, might threaten the affordability of computing. We further argue that
chip multiprocessing constitute our best hope for reverting these power
inefficiency trends, and that chip multiprocessing architectures are a very good
match to the computational requirements of large scale internet services.