Potenza is a first generation 64b ARM v8 processor and memory sub-system of the X-GeneTM server platform [1]. The Potenza processor module (PMD) is an integrated design unit, comprising two identical cores sharing a 256KB L2 cache, and is designed to be scalable for different server configurations. Each PMD contains 84 million transistors, occupying over 14.8mm2, and averages 4.5W under representative workloads. The initial platform is configured with 4 PMDs, a shared 8MB L3 cache, and 4 DRAM channels arranged around a central switch. Potenza can operate up to 3GHz at 0.9V supply and is fabricated in a 40nm bulk CMOS technology using 10 metal layers (Fig. 5.8.7).