Patent ID: 8633709

Claim:
A system for testing a motherboard performance comprising: a control device adapted to store a plurality of predetermined voltage values and output control signals according to the plurality of predetermined voltage values; a voltage processing circuit adapted to receive the control signal and output a plurality of PWM (pulse width modulation) signals according to the control signal; a voltage regulating circuit adapted to receive the plurality of PWM signals and output a plurality of DC (direct current) voltages to a plurality of voltage input terminals of the motherboard; and a voltage feedback circuit adapted to collect voltage signals at the plurality of voltage input terminals of the motherboard; wherein the control device is adapted to receive the voltage signals at the plurality of voltage input terminals of the motherboard and adjust the control signal according to the voltage signals; the voltage processing circuit is adapted to adjust the plurality of PWM signals according to the control signal; and the voltage regulating circuit is adapted to adjust the plurality of DC voltages output to the motherboard according to the plurality of PWM signals; wherein the voltage feedback circuit comprises a first variable resistor, a second variable resistor, a third variable resistor and a fourth variable resistor; the first variable resistor comprises a first variable resistor first terminal and a first variable resistor adjust terminal; the second variable resistor comprises a second variable resistor first terminal and a second variable resistor adjust terminal; the third variable resistor comprises a third variable resistor first terminal and a third variable resistor adjust terminal; the fourth variable resistor comprises a fourth variable resistor first terminal and a fourth variable resistor adjust terminal; the first variable resistor first terminal, the second variable resistor first terminal, the third variable resistor first terminal and the fourth variable resistor first terminal are adapted to collect voltage signals at the plurality of voltage input terminals of the motherboard; and the first variable resistor adjust terminal, the second variable resistor adjust terminal, the third variable resistor adjust terminal and the fourth variable resistor adjust terminal are adapted to output voltage signals at the plurality of voltage input terminals of the motherboard which are decreased.