What manages and control the speed of a motherboards buses

Bus speed is measured by MHz. It all depends where buses are on a computer or laptop or pc. The front side bus speed is often used as an important measure of the computer.

Explanation:

Buses speed is used to data transfer from mother boards to ram or from side connection such printer hard disk extra,

Speed range is from 66 MHz to over 800 MHz is used for data speed.  It is used FSB (front side bus)

Cpu motherboards reach the memory controller and another connecting device. Bus speed determines the performance of a computer or laptop or desktop.