Sapphire Radeon X1900XT 512MB. Graphics processor: Radeon X1900 XT, Maximum resolution: 2048 x 1536 pixels, Processor clock speed: 625 MHz. Graphic adapter memory: 512 MB, Graphics adapter memory type: GDDR3, Memory bus: 256 bit. Interface type: PCI Express. DirectX version: 9.0, Shader model version: 3.0. Compatible operating systems: Microsoft Windows 2000 Microsoft Windows XP