PowerColor HD 4890. Graphics processor: Radeon HD4890, Maximum resolution: 2560 x 1600 pixels, Processor clock speed: 900 MHz. Graphic adapter memory: 1024 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, OpenGL version: 2.0