EVGA GeForce 9800 GT 512 MB DDR3 PCI-Express 2.0 Graphics Card (512-P3-N973-TR) Full DirectX 10 and Open GL 2.1 Support 900 MHz clock with 1100 MHz effective memory rate and 1500 MHz Shader Clock GeForce 9800 GT with 600 MHz clock PCI Express 2.0 Compatible 512MB 256-bit 1.0 ns GDDR3 memory PCI Express 2.0 Compatible GeForce 9800 GT with 600 MHz clock 512MB 256-bit 1.0 ns GDDR3 memory 900 MHz clock with 1100 MHz effective memory rate and 1500 MHz Shader Clock Full DirectX 10 and Open GL 2.1 Support