The cross-load diagram looks good. The W0083 easily copes with any permissible load. In the most important section of the diagram (the bottommost third of it), the +12V voltage is close to the nominal value while the +5V voltage is slightly higher than necessary, but doesn’t violate the allowable limits.

At a load of 550W the voltage ripple is 33 millivolts on the +5V line, 50 millivolts on the +12V line and 30 millivolts on the +3.3V line. Most of this ripple is due to 100Hz pulsation (the doubled frequency of the electricity network in our area) whereas high-frequency pulsation is not very intensive.

The PSU employs a Hong Sheng A1225S12D fan. Its speed depends but slightly on the temperature at loads below 200W, remaining always at about 1250rpm. The speed grows up rapidly at higher loads, getting as high as 2500rpm. So, the noise parameters of this power supply are average, just like those of many other models from Thermaltake. The W0083 is not exactly quiet or loud. Its fan is audible, but most users won’t mind that. The fan is fast under high loads, but this usually means that the owner of the computer plays some heavy 3D game and is not likely to bother about the noise from the power supply.

The efficiency of this PSU is expectably good (the W0049 was efficient, too) at about 83% on average. The power factor is not very high at 0.95 in comparison with other models with active power factor correction, but any PSU with active PFC is much better in this respect than PFC-less units and units with passive PFC that have a power factor of 0.65-0.68 and 0.7-0.75, respectively.

So, the W0083 is a variation of the second-revision W0049 with slightly lower wattage and a 12cm cooling fan. It costs $5-10 less than the W0049 but doesn’t differ from it in the actual parameters, especially considering that most computers just don’t need the extra wattage of the W0049. What’s interesting, the W0049 with its two small fans proved to be quieter at work than the W0083 with a single large fan. I think the fan speed is managed not optimally in the latter model. They could have set the speed lower without worsening the cooling of the PSU.