This is the second part of our discussion about PUE and how I believe it should be used for those who are beginning on their journey to improve power effectiveness within their data centres.  In the first part we spoke about the basics of PUE and what the metric gives you.  In this part I discuss where to focus to reduce your PUE, what benefits must be derived it and when, pragmatically, you should NOT consider PUE improvement as an option.