According to our methodology, Thermaltake TR2 RX 750 W cannot deliver its labeled wattage. It burned after one minute delivering 750 W at a room temperature a little bit above 45º C. Thinking that we may have got a defective unit, we asked Thermaltake another sample, which burned exactly the same way. In both units the component that burned was one of the +12 V rectifiers.
Efficiency was always high when we pulled up to 60% of the power supply maximum load (i.e., up to 450 W), between 84.5% and 86.4%. But at 80% load (600 W) efficiency dropped to 81.9%, still above the 80% mark. At full load we couldn’t measure efficiency, because the unit burned before we could read all numbers.
Not being able to deliver its labeled wattage is not the worst about this power supply. Noise and ripple levels were way above the maximum allowed during tests four and five. With the first sample, noise levels during test four was 130.2 mV at +12VA and 127.6 mV at +12VB, jumping to 183.8 mV and 166.8 mV during test five, respectively. We got even worse results with the second sample, as it also failed on +5 V and +3.3 V, as we summarize in the table below. The maximum allowed is 120 mV on +12 V and 50 mV on +5 V and +3.3 V. All these numbers are peak-to-peak figures. Below we show the scope waveforms for you to see the problem.