ASUS Radeon X1600PRO, 512MB DDR2, GDDR2, 128 bit, 540 MHz, 2048 x 1536 pixels ASUS Radeon X1600PRO, 512MB DDR2. Processor frequency: 500 MHz. Graphics card memory type: GDDR2, Memory bus: 128 bit, Memory clock speed: 540 MHz. Maximum resolution: 2048 x 1536 pixels. DirectX version: 9.0c, OpenGL version: 2.0