The cross-load diagram for this power supply looks nearly perfect. It is predominantly green; the voltages never go beyond the acceptable limits in any point of the diagram, so the boundary of the diagram is determined by the specified load capabilities of the PSU (for example, the slanting top right of the diagram is the limitation of the maximum output power at 530W, this line is wavy due to bilinear interpolation of the graph from separate dots into a solid fill).

It’s no worse with the output voltage ripple. There is almost no low- or high-frequency pulsation. At a load of 530W the voltage ripple is a mere 15 millivolts on the +5V rail, 30 millivolts on the +12V rail and 10 millivolts on the +3.3V rail.

The PSU is equipped with a TT-1225A fan (it is actually manufactured by Adda, the AD1212UB-A73GL model; note that the W0093 employs a fan marked as TT-1225A, too, but it is quite a different model!). The dependence of the fan speed on the load is not linear, and resembles an exponent, rather. The speed grows up quickly as the load is getting higher. The speed ceiling is low, however, at less than 2000rpm, so the PSU is not noisy even under maximum load. On the other hand, it is not absolutely noiseless. The fan rotates at about 1050rpm at the minimum. This is good, but you can meet better (for example, the minimum fan speed is below 750rpm in the Zalman ZM460-APS, the FSP Epsilon, and in the Seasonic S12).

The efficiency of this PSU is average, reaching 80% at the maximum. The power factor is low, about 0.65 on average, due to the lack of any kind of power factor correction.

The Toughpower left a good overall impression on me. This is a high-quality product with very good parameters, maybe except for its power factor, but this parameter is not very important for ordinary users. It has all the connectors you may need, delivers stable voltages with low pulsations, and is quiet at work. I should note, however, that the W0097 is not at all cheap. Its price of $120 is quite a lot for a 550W power supply.