AMD FirePro D300

The AMD FirePro D300 was a dual graphics card that was released on December 19, 2013 by Apple as the entry-level GPU option for the 2nd-generation Mac Pros. The FirePro D300 is based on a chipset developed by Advanced Micro Devices (AMD). It was only available as a build-to-order option and was not sold separately from the Mac Pro.

Description
The AMD FirePro D300 is based on AMD's Pitcairn workstation graphics chip that was fabricated on the 28 nm process. The GPU clock speed was 850 MHz, which could be boosted to 1.27 GHz, producing up to 2.176 teraflops each. Each contained 2 GB of GDDR5 video RAM. The cards were pre-installed in pairs which took up the space of two customized PCIe 3.0 x16 slots within the 2nd-generation Mac Pro. Each card can support up to four Mini DisplayPort 1.2 ports; the pair of cardsare connected to the six Thunderbolt 2 ports and one HDMI port of the Mac Pro. The cards are not identical as one includes a proprietary slot that can accept a SSD based on a PCIe 2.0 x4 interface.