• 3.7GHz, Quad-Core Intel Xeon E5 with 10MB L3 cache and Turbo Boost up to 3.9GHz Configurable to 3.5GHz 6-core processor with 12MB L3 cache, 3.0GHz 8-core processor with 25MB L3 cache, or 2.7GHz 12-core processor with 30MB L3 cache • 12GB (three 4GB) of 1866MHz DDR3 ECC memory, configurable to 16GB (four 4GB), 32GB (four 8GB) or 64GB (four 16GB) • Dual AMD FirePro D300 graphics processors with 2GB of GDDR5 VRAM each • Connect up to three 4K displays or six Thunderbolt displays • 256GB PCIe-based flash storage, configurable to 512GB or 1TB • Combined optical digital audio output/analog line out minijack • 802.11ac Wi-Fi wireless networking, 3 IEEE 802.11a/b/g/n compatible. Bluetooth 4.0 wireless technology