Apple Mac Pro Desktop Computer (Quad-Core) ME253
3.7 GHz Intel Xeon E5 Quad-Core12GB of 1866 MHz DDR3 ECC RAM256GB PCIe-based Flash StorageDual AMD FirePro D300 GPUs (2 x 2GB)Six Thunderbolt 2 PortsFour USB 3.0 Ports, One HDMI 1.4 PortSupports up to Three 4K Displays802.11a/b/g/n/ac Wi-Fi, Bluetooth 4.0Unique Compact Cylinder DesignMac OS X El Capitan or macOS Sierra