Diamond Stealth ATI Radeon HD 2400 PRO  512MB PCIE GDDR2  Video Card PCI Express x-16 Radeon HD 2400 PRO with 525 MHz clock and 512 MB of 64 Bit-GDDR2 Memory 800 MHz effective memory speed Dual DVI and HDTV Support Optimized for Windows Vista with Direct X 10 support