MAGIC sites no machines are needed. 

CS/6x/Expanse sites 2 machines are needed:

Background Job Server

Virtual or physical Windows Server 2008+ (2012 preferred)  8+ GB RAM  100+ GB hard drive  Administrator Account  Remote Access

File Server

Virtual or physical Windows Server 2008+ (2012 preferred)  4+ GB RAM 2 hard drives:   * OS drive - (C:) drive with 100+ GB to house OS   * Data drive - (E:) drive with 100+ GB for HCI universe Administrator Account Remote Access Customer required to conduct daily backups of the E drive