Full Details from Amazon.com : http://www.amazon.com/gp/product/B001SJLLTQ?tag=onigi-20
Sapphire Radeon HD4550 512 MB DDR3 VGA/DVI/HDMI PCI-Express Video Card 100252HDMI
64-bit DDR3 memory interface
Microsoft DirectX 101 support
OpenGL 20 support
Unified Superscalar Shader Architecture
PCI Express 20 x16 bus interface
