 Many original models of the Presario 1200 series ran on AMD K6-2 processors, which was quite an adventurous move at a time when AMD was very much second place to the dominant market leader Intel.The chips were notable for their inclusion of 3D-NOW technology, enabling marked performance increases from the original K6.The chips came in a variety of speeds, ranging from 333 MHz to 550 MHz, however performance varied only slightly between models.