Gigabyte ATI Radeon HD 5770 1 GB DDR5 VGA/DVI PCI-Express Video Card GV-R577SL-1GD Chipset: Radeon HD 5770 Core Clock: 850 MHz Memory Clock: 4800 MHz Memory Type: GDDR5 Memory Size: 1GB Memory Interface: 128-bit D-sub: Yes DVI: Yes DirectX: DirectX 11 OpenGL: OpenGL 3.1