Brand : Apple

 The  model with the 3.5 GHz processor features a six-core  "Ivy Bridge" CPU, dual AMD FirePro graphics, fast PCIe-based flash storage, and DDR3 ECC memory. 
Detailed Specifications
Category 
Detail
Processor3.5 GHz  (Turbo Boost up to 3.9 GHz)
Architecture64-bit architecture with 12 MB of L3 "Smart Cache"
Memory (RAM)16 GB of 1866 MHz DDR3 ECC SDRAM, configurable up to 128 GB via four user-accessible DIMM slots
GraphicsDual AMD FirePro D500 graphics processors, each with 3 GB of GDDR5 VRAM
StorageNO storage 
I/O Ports6 x Thunderbolt 2 ports, 4 x USB 3.0 ports, 2 x Gigabit Ethernet ports, 1 x HDMI 1.4 Ultra HD port
AudioCombined optical digital audio output/analog line out minijack, 3.5 mm headphone jack, built-in speaker
Wireless802.11ac Wi-Fi wireless networking, Bluetooth 4.0 wireless technology
Dimensions9.9 inches (Height) x 6.6 inches (Diameter)
Weight11 pounds (4.99 kg)
Power450W maximum continuous power