The Google cluster used to be constructed from 1 rack unit (RU) PCs, each with one processor and two disks. Today there are considerably denser options. How much less floor space would it take if we were to replace the 1 RU PCs with modern alternatives? Go to the Compaq or Dell Web sites to find the densest alternative. What would be the estimated impact on cost of the equipment? What would be the estimated impact on rental cost of floor space? What would be the impact on interconnection network design for achieving power/ performance efficiency?