ATI Radeon HD 5870

The ATI Radeon HD 5870 was a high-end graphics card marketed by Advanced Micro Devices (AMD) and released by Apple in August 2010 as a build-to-order option for the 2010 1st-generation Mac Pro. It is based on a GPU chipset originally developed by ATI Technologies (which was acquired by AMD). In June 2012, it became available for separate purchase for 2009 to 2012 Mac Pro models.

Description
The Radeon HD 5870 is based on ATI's high-end Cypress XT workstation graphics chip that was fabricated on the 40 nm process. The GPU clock speed was 850 MHz, which could be boosted to 1.2 GHz, producing up to 2.72 teraflops. It contained 1 GB of GDDR5 video RAM. The card features one dual-link DVI port and two Mini DisplayPort ports. It took up the space of a double-wide PCIe 2.0 x16 slot, and required two auxiliary power cables.

Support
The Radeon HD 5870 required a minimum of Mac OS X 10.6.4 (Snow Leopard). Some Mac Pros required a Snow Leopard Graphics Update for improved stability, which was incorporated into Mac OS X 10.6.5 and later. The card was supported through macOS 10.13.6 (High Sierra). However, it does not support Metal, and as a result will not work with macOS Mojave (10.14) or later.