Sapphire ATI RADEON™ HD 2900PRO 1024Mb. Graphics processor: Radeon HD2900 Pro, Maximum resolution: 2560 x 1600 pixels. Graphic adapter memory: 1024 MB, Graphics adapter memory type: GDDR4, Memory bus: 512 bit. Interface type: PCI Express. Shader model version: 4.0, OpenGL version: 2.0. Compatible operating systems: Windows 98/Me/2000/XP/Vista