One more.

50. In contrast to the fixed frequency of the Magar crystal oscillator, the invention of the '336 patent is variable-speed, in that its frequency and operating characteristics (e.g.,
transistor propagation delay) change with variations in voltage and temperature on the semiconductor substrate, and with respect to process variations from when the chip was manufactured. Also, because the ring oscillator and the CPU are located on the same
semiconductor substrate, the variations in voltage, temperature, and process parameters affect each of these circuit elements relatively equally, so the speed and operating characteristics of
each will vary together. The "variable-speed" nature of the '336 patent invention's ring oscillator, and the "vary together" nature of the changes in the ring oscillator and CPU, are both achieved because the "entire" ring oscillator is on the same semiconductor substrate as the CPU. This fact was highlighted by applicants' attorney in distinguishing the '336 patent invention from the crystal oscillator of Magar, which uses an external crystal as a fixed-frequency oscillator that does not vary together with the speed of the CPU. Amd. 7/03/97 at 3-5, Ex. 8; Amd. 2/06/98 at 3-4, Ex. 9.