Physical memory is a critical component of all VMware Infrastructure 3 (VI3) deployments, and appropriate sizing is necessary to ensure the success of solutions based on VI3, such as Server Consolidation. Provisioning the ideal amount of physical memory for VI3 components is more important as systems with an ever increasing number of CPU cores and processing threads rise in popularity. This paper defines the planning process for determining the appropriate amount of memory for a VI3 deployment, dispels some common misconceptions, and describes the consequences of sub-optimal sizing.