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