difference
Four nanometers versus five nanometers means the chip uses less energy and is more powerful.
Nanometer (symbol :nm), that is, nanometer, is a unit of measurement of length.
1 nanometer =10 to the minus 9 meters. One nanometer is four times the size of an atom, much smaller than the length of a single bacterium. Individual bacteria are virtually invisible to the naked eye, measuring about five microns in diameter with a microscope. Suppose the diameter of a hair is 0.05 mm, and it is split axially into an average of 50,000 strands, each of which is about 1 nanometer thick. In other words, 1 nanometer is 0.000001 mm.