The microprocessor chip is located on a large circuit board called the main board or motherboard . The physical size of a computer chip is very small, as the ant below illustrates. Vacuum tube - oldest type. Didn't hold up long and generated a lot of heat. Core - small metal rings.
Magnets tip a ring to left or right, which represents on and off.
Semiconductor - integrated circuit on a chip. This is what modern computers use for memory. Smaller numbers are better since that means it takes less time to access one memory address. The capacity of a memory chip is measured in megabytes . Motherboards have only so many slots for memory so there are limits.