HP SG764AA, Radeon HD4550, GDDR2, 64 bit, 2048 x 1536 pixels, PCI Express x16 HP SG764AA. Graphics processor family: AMD, Graphics processor: Radeon HD4550. Graphics card memory type: GDDR2, Memory bus: 64 bit. Maximum resolution: 2048 x 1536 pixels. DirectX version: 10.1, OpenGL version: 2.0. Interface type: PCI Express x16