ASUS Radeon X1950 XTX 512MB, GDDR4, 256 bit, 2000 MHz, 2048 x 1536 pixels ASUS Radeon X1950 XTX 512MB. Processor frequency: 650 MHz. Graphics card memory type: GDDR4, Memory bus: 256 bit, Memory clock speed: 2000 MHz. Maximum resolution: 2048 x 1536 pixels. DirectX version: 9.0, OpenGL version: 2.0, Dual Link DVI