HIS HD 4850 Fan. Graphics processor: Radeon HD4850, Maximum resolution: 2560 x 1600 pixels, Processor clock speed: 625 MHz. Graphic adapter memory: 512 MB, Graphics adapter memory type: GDDR3, Memory bus: 256 bit. Interface type: PCI Express 2.0. DirectX version: 10.1, Shader model version: 4.1, OpenGL version: 3.1. Compatible operating systems: Windows Vista