The nm chip is a unit of nanometers, indicating the distance between the transistors in the chip, the technical term is called the gate length. The current chip is in the nanometer as a unit to express its degree of technology. Under normal circumstances, the smaller the grid length, the more advanced the process of the chip.
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Simply speaking, XX nm refers to the gate width of the complementary oxide-metal semiconductor field-effect transistor formed on the CPU, also known as the gate length. It's a word you hear a lot on the chip.