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PSU Roundup: Performance, Price, Efficiency

Thermaltake Toughpower QFan 650W (Continued)

At the three load levels (low, medium and high), the voltages are within the allowed deviations.

However, the situation changes dramatically at low loads. If the current on the 12-volt lines drops below 1 amp, the voltage on the 5 volt line decreases drastically. At a load of 0.42 amps, we measure only 4.03 volts (minimum value according to specification is 4.75 volts). At even lower loads the voltage drops to 3.8 volts. This is clearly a malfunction. The manufacturer has not yet responded to this concern.

Due to these issues, the Low-Power PC Test could not be performed.

The power supply can be purchased online for right around $150.