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 add qf 616038 for an extra 8gb or add qf 699643 for an extra 16gb hard drive options add qf 408707 for 500gb or for 1tb add qf 408709 os options recommended are qf 628208 server 2012 r2 standard rok or qf 667050 s