Diamond Viper ATI Radeon HD 2600 PRO  256MB PCIE GDDR2  Video Card PCI Express x-16 Radeon HD 2600 PRO with 600 MHz clock and 256 MB of 128 Bit-GDDR2 Memory 800 MHz effective memory speed Dual DVI and HDTV Support Optimized for Windows Vista with Direct X 10 support