mac pro 2013

Apple unveiled a completely redesigned macpro during 2013. The macpro 2013 was revealed an overhauled case design, a polished silver aluminum cylinder built around a central thermal dissipation core and vented by a single fan, which pulls air from under the case, through the core, and out the top of the case. 

The macpro  has a vastly redesigned configuration of ports. With a HDMI 1.4 port, dual Gigabit Ethernet ports, six Thunderbolt 2 ports, four USB 3 ports, and combined digital Mini-TOSlink optical / analog 1⁄8" stereo mini jacks for sound in and out. The thunderbolt 2 ports support up to 36 thunderbolt devices (six per port) and can support up to 3 simultaneous 4k displays. This design requires 2 GPUs to support the 7 display outputs (HDMI and 6 Thunderbolt).

The new macpro removes the ability to replace hard drives by foregoing the four 3.5-inch drive bays for proprietary PCIe-channel flash storage. It also removes the ability to add PCIe cards internally, leaving the RAM as the only user-serviceable part. The I/O panel is illuminated when the unit senses it has been moved to make it easier for the user to see the ports.