Sapphire Radeon HD 4870 512MB. Graphics processor: Radeon HD4870, Maximum resolution: 2560 x 1600 pixels, Processor front side bus: 750 MHz. Graphic adapter memory: 512 MB, Graphics adapter memory type: GDDR5, Memory bus: 256 bit. Interface type: PCI Express 2.0. DirectX version: 10.1, Shader model version: 4.1