Sapphire Technology have today announced the availability of its Radeon HD 7950 Mac Edition:
The SAPPHIRE HD 7950 Mac Edition is equipped with 3GB of the latest GDDR5 memory, and its Dual Asynchronous Compute Engines (ACE) deliver up to 2.87 TFLOPS Single Precision compute power. It provides hardware support for Open GL 4.2 and Open CL 1.2 as well as AMD HD3D technology and APP acceleration.
They somewhat unhelpfully compare it to the four-and-a-half year-old Nvidia 8800GT, claiming a 300% performance improvement, but that said, this is the first official Mac Pro graphics card in quite a long time.
The card provides two mini-DisplayPort outputs and one HDMI 1.4a, for a maximum resolution of 3840×2160 per display (retina display, anyone?), and a dual-link DVI port for older monitors. The card will only work in a 2010 Mac Pro running 10.7.5 or later, and is currently priced around the $480 mark.
It also runs in Windows-based systems.