The fujitsu primergy tx2540 m1 is the perfect tower server for smes as well as branch offices it supports up to two processors and combines affordable performance with balanced expandability for an additional processor please see qf 666801 memory options available up to 192gb max add qf 669643 for 16gb hard drive options add qf 408706 for 500gb or for 1tb drive add qf 398750 os options recommended are qf 628208 server 2012 r2 standard rok or qf 667050 server 2012 r2 essentials rok 3