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Arithmetic and logic unit is commonly known as ALU, is an important device in all the digital devices, it is the heart, which performs all the computations that user needs from the device. By expanding the interest for upgrading the capacity of processors to deal with the more troublesome and testing undertakings has brought about the combination of a few processor cores into one chip. All things considered, the load on the processor is more in the conventional framework. An ALU actualized a central building block of the CPUof a computer. It is a combinational rationale unit that plays out its intelligent or math tasks. ALU is getting more modest and more troublesome these days to empower the advancement of all the more powerful yet more modest computers. In, this task, an exertion is made to plan a 8-digit ALU in GDI the rationale that can perform 16 alternatives in both 90nm and 45nm, the other output of these activities are given to a MUX where just the ideal output is chosen and shown. Speed, power utilization, accuracy are the vital components to be taken while during the plan of the ALU. The 8-cycle ALU has been planned, actualized and analyzed in standard gpdk45nm and 90nm utilizing the CADENCE tool. The boundaries like force, delay have been calculated in both 45the nm and 90nm and have been thought about.