EVGA nVidia GeForce 9800GT 1 GB 2DVI/HDCP PCI-Express Video Card 01G-P3-N981-TR Full DirectX 10 and Open GL 2.1 Support 900MHz clock with 1800MHz effective memory rate and 1500MHz shader clock 9800 GT with 600MHz clock PCI Express 2.0 1GB of GDDR3 memory PCI Express 2.0 9800 GT with 600MHz clock 1GB of GDDR3 memory 900MHz clock with 1800MHz effective memory rate and 1500MHz shader clock Full DirectX 10 and Open GL 2.1 Support