ATI Radeon HD2900XT 512MB S-Video Dual DVI PCI-Express x16 Graphics Video Card 7121032900G.ATI GPU Model Number: Radeon HD 2900XTATI Part Number: 7121032900GCompatible Part Numbers: 2900XT512PE 102B0060100Specifications:Interface: PCI-Express x16GPU Model: ATI Radeon HD 2900XTCore Clock: 740 MHzStream Processors: 320Memory Size: 512MBMemory Interface: 512-BitMemory Type: GDDR3RAMDAC: 400MHzEffective Memory Clock: 1650 MHz3D API:DirectX 10OpenGL 2.0Ports:2 DVI1 S-VideoCrossFireX Support: YesMax Resolution: 2560 x 1600VIVO: YesHDCP Ready: YesDual-Link DVI Supported: YesCooler: With FanOperating Systems Supported:Windows 2000, XP with Service Pack 2 (SP2), VistaSystem Requirements:AMD Athlon or Intel Pentium 4512MB of system memory, 1GB or more for best performance.Optical drive for installation software (CD-ROM or DVD-ROM drive).A 750 Watt or better power supply with two 2x3-pin PCIe power connectors. For optimal performance, we recommend requires one 2x3-pin and one 2x4-pin PCIe power connector