Diamond Viper ATI Radeon HD 2900 XT PCIE 1GB GDDR4 Video Card PCI Express x-16 Radeon HD 2900XT with 825 MHz clock and 1GB of 512 Bit-GDDR4 Memory 2.0 GHz effective memory speed Dual DVI and HDTV Support Optimized for Windows Vista with Direct X 10 support