Apple Mac Pro MD770LL/A Desktop (OLDER VERSION) (Discontinued by Manufacturer) Single 3.2 GHz Quad-Core Intel Xeon Processor 6 GB of 1066 MHz DDR3 ECC SDRAM (three 2 GB DIMMs) 1 TB Serial ATA Hard Drive (3Gb/s; 7200 rpm) ATI Radeon HD 5770 Graphics with 1 GB of GDDR5 Memory Mac OS X v10.8 Mountain Lion Operating System