We are in the pilot stage of a NAC v2 Framework rollout for our 4000 seat network and have funding available to purchase a high spec server to be deployed as the primary ACS box. The server will also handle our TACACS requirements for accessing network devices. I know I could simply go with the Cisco recommended build, however with a view to the future of managing NAC requests for 4000 PCs, I am keen to over spec the box where this would be useful. I have options to increase RAM, Processors and Disk configuration. Which of these will be advantageous?