Sapphire Radeon HD 7950 Mac Edition 3GB DDR5 HDMI/DVI-I/Dual Mini DP PCI-Express Graphics Card 11196-15-40G Supports Dual Firmware: Via Firmware switch controller, Sapphire HD 7950 MAC Edition supports Mac OS X/Windows under non-UEFI compliant mode, or Windows under UEFI hybrid firmware enabled. 800 MHz core speed 5000 MHz Effective memory speed 384-bit GDDR5 memory interface Open GL 4.2 Support AMD HD3D Technology Display Port 1.2