X550 Pcie 256 Mb Product Description Diamond Stealth Express ATI Radeon X550 - graphics adapter - Radeon X550 - 256 M Stealth DIAMOND STEALTH x550 PCI Express 256 MB--System Builder Packing Device Type Graphics adapter Enclosure Type Plug-in card Interface Type PCI Express x16 Graphics Processor / Vendor ATI Radeon X550 Core Clock Speed 400 MHz RAMDAC Clock Speed 400 MHz API Supported DirectX 9.0, OpenGL 2.0