HP KT979AA, GDDR4, 256 bit, 2560 x 1600 pixels, PCI Express x16 HP KT979AA. Graphics card memory type: GDDR4, Memory bus: 256 bit. Maximum resolution: 2560 x 1600 pixels. DirectX version: 10.1, OpenGL version: 2.1, Dual Link DVI. Interface type: PCI Express x16. Cooling type: Active