EVGA 512-P3-N879-AR GeForce 9800 GTX + 512 MB DDR3 PCI-Express 2.0 Graphics Card PCI Express 2.0 Compatible GeForce 9800 GTX with 740MHz clock 512MB 256-bit 0.8 ns GDDR3 memory 1100 MHz clock with 2200 MHz effective memory rate Full DirectX 10 and Open GL 2.1 Support