CPU plug-and-play method and device

A CPU plug-and-play device, comprising:

• an I/O chip which is controlled by a signal generated upon turning on a power supply of a computer to which the CPU is mounted, the chip generating, in response thereto, reset signals for resetting ISA and PCI buses of a main board of the computer, a latching signal, and a CPU bus control signal, and transmitting a desired CPU working frequency which is set by a computer user selected setting signal via firmware of the computer to a multiple frequency factor control circuit through a universal bus;
• a system logic chip which receives the latching signal to maintain a status of the system logic chip in response to receiving a chip reset signal from the multiple frequency factor control circuit, and generates a CPU reset signal to reset the CPU so as to cause the CPU to be rebooted with a desired working frequency;
• and
• the multiple frequency factor control circuit receiving the desired working frequency which is set via the system firmware with the computer user selected setting signal, which setting signal is encoded by a circuit to generate and apply the multiple frequency factor to the CPU.