Power dissipation has a major impact while the authors are designing any circuit. Since this factor plays a major role in deciding the efficiency of the designed circuit i.e. why in this paper, they are proposing a plan for sequential circuits so that they can reduce the power dissipation. power dissipation which in turn reduces the whole power dissipation of CPU. With this they can reduce the overall power dissipation substantially in the circuit. In this paper, the comparative analysis of various comparator circuit design of ALU is presented to reduce Power dissipation of CPU.