Patent ID: 8102180

Claim:
A central processing unit (CPU) voltage testing system to test CPU core voltages of a CPU, the testing system comprising: a pulse-width modulation (PWM) controller to receive voltage identification (VID) code signals to output corresponding PWM signals; a voltage converting module to receive the PWM signals to output corresponding voltage signals to the CPU; and a voltage testing module, comprising: a parameter storing unit storing a plurality of VID codes and a plurality of allowable voltage ranges; a data processing unit to output a plurality of VID code control signals according to the plurality of VID codes; a VID code coding unit to receive the VID code control signals and generates corresponding VID code signals to the PWM controller; and a voltage collecting unit to collect CPU core voltages of the CPU and output the collected CPU core voltages to the data processing unit, wherein the data processing unit determines whether the collected CPU core voltages are within the plurality of allowable voltage ranges.