Apple Mac Pro 5.1 (2009-2010) 12-Core 3.33GHz, 16GB RAM, 2TB HD, 256 SSD HD, Nvidia GT120,10.10.2 Yosemite 2x Intel Xeon 'Westmere' 6-Core 3.33Ghz Processors (12-Cores; 24-Threads) 16GB DDR3 1066Mhz ECC Memory - 2TB 7200-rpm Hard Drive 256SSD HD Nvidia GT120 Airport Extreme Wireless Card, Bluetooth, Superdrive This mac is an upgrade from the 4,1 to 5,1 with 2x Intel Xeon 'Westmere' 6-Core 3.33Ghz Processors (12-Cores; 24-Threads)