HP ATI Radeon HD4550 256MB DDR3 S-Video DMS-59 PCI-Express 2.0 x16 Graphics Video Card 538051-001.ATI Model Number: Radeon HD 4550HP Part Number: 538051-001ATI Part Number: ATI-102-B88901Compatible Part Numbers: 534547-001 102B8890100Specifications:Card Interface: PCI-Express x16 Graphics Processor: ATI Radeon HD 4550 Clock Speed: 600 mhz RAMDAC Clock Speed: 400 mhz Installed Memory: 256mb Memory Technology: DDR3 sdram Memory Clock Speed: 800 mhz Memory Data Width: 64-bit Max Screen Resolution: 2560x1600 API Supported: OpenGL 2.0DirectX 10.1HDCP Compatible: yes Ports: 1 S-Video1 DMS-59System Requirement: Windows vista business 64, windows vista business 32, windows vista home basic 32, windows xp professional or windows xp home 32