Refurbished Apple Mac Pro 6,1/Xeon E5-1620v2/64GB RAM/1TB SSD/AMD D300 X2/B-(Late 2013)

Refurbished Apple Mac Pro 6,1/Xeon E5-1620v2/64GB RAM/1TB SSD/AMD D300 X2/B-(Late 2013)

Apple explained that these "Space Gray" cylinder Mac Pro models are "designed around an innovative unified thermal core" and have not only faster processors than earlier models but also dual workstation class graphics processors, faster memory, and faster PCIe 2.0 x4 flash storage. Instead of internal expansion, the system provides extensive high speed ports for external connectivity options.

Specifically, this model -- the Mac Pro "Quad Core" 3.7 (Late 2013) -- is powered by a single 3.7 GHz Quad Core 22-nm Xeon E5-1620v2 processor with a dedicated 256k of level 2 cache for each core and 10 MB of level 3 "Smart Cache." 

Connectivity includes six Thunderbolt 2 ports, one HDMI 1.4 UltraHD port, 4 USB 3.0 ports, and Dual Gigabit Ethernet ports in addition to 802.11ac and Bluetooth 4.0.

Originally, this model reportedly supported as many as three 4K displays or six Thunderbolt displays. However, on June 16, 2015, without updating the graphics cards themselves, Apple quietly increased the official support to as many as three 5K displays (5120x2880) -- two using Thunderbolt 2 ports and one using the HDMI port. The support for as many as six 2560x1600 displays using all six Thunderbolt 2 ports remained unchanged.