The stability of the output voltages is much better than with the above-described PSUs: these two models easily handle high loads on the +5V rail. The +3.3V voltage fluctuates rather greatly here, too, but is closer to the norm (this voltage equaled 3.3V at small loads with the PSUs described above, but at medium loads here).

As a kind of compensation for the good stability the ripple has got stronger and now exceeds the allowable maximum on the +5V rail a little. At 300W load power the ripple diminishes to meet the requirements, though.

There’s the same problem with the fan speed control here: the speed changes from lowest to highest in a jump. The only difference from the earlier-described units is that the moment of the jump is a hundred watts higher. The maximum speed of the fan is higher, too – 2300rpm. It is quite a lot for a 12cm fan, so the power supply is not quiet at such speeds. By the way, this kind of speed control explains why there exist two contradicting opinions about the noise parameters of In-Win units among the users: these power supplies are really quiet at low loads, but may become the noisiest component of the computer under high loads.

The efficiency of the PSUs is similar to the models described above – about 75%. The unit with passive PFC has a power factor of 0.75-0.78 against the PFC-less unit’s 0.68-0.7. The last thing once again confirms my point that passive power factor correction only helps the manufacturer meet the European requirements to the harmonics in the current consumed by the electronic device (switching power supplies without PFC don’t meet these requirements at all and thus cannot sell in Europe). Passive correction affects but slightly the power factor proper.

So, the IW-P430J2-0 and IW-P430J3-1 only differ from the junior models in quantity rather than quality: the maximum allowable load power, the number of the connectors and the length of the cables have all increased a little, and that’s all.