The senior model could work with an APC SmartUPS SC 620 at a load up to 310W irrespective of the power source (electric mains or batteries); the switching to the batteries was performed without problems. The junior model’s output power was limited by its own capabilities rather than by the UPS.

At a load of 330W there is a voltage ripple of about 9 millivolts on the +5V rail, 17 millivolts on the +12V rail, and 12 millivolts on the +3.3V rail. There is no low-frequency pulsation here. The results of the junior PSU model aren’t much different.

The two models have produced almost identical cross-load diagrams, save for the difference due to their max output power. The diagrams look good. It is only the +12V voltage that reaches the maximum allowable deflection, but it does so when there is a very high load on the +5V rail, an improbable situation for modern computers.

An ARX FD1212-S3142E fan is installed in each PSU, and its speed is steadily increasing as the temperature grows up (the sensor is fastened on one of the juts of the heatsink with diode packs). The speed is about 1100rpm at maximum, so these are average-noisiness models, too. The fan is perfectly audible at that speed. Quite a lot of users wouldn’t have anything against it, but you may want to consider other PSU models if you want to have a silent computer.

The efficiency of the PSUs is about 79%. That’s not impressive by today’s standards, yet better by a few percent than with the previous models. The power factor is about 0.65, which is a typical value for PFC-less products.

So, notwithstanding their compliance with the ATX12V 1.3 standard, the new PSUs from In-Win don’t look too bad. The company has finally transitioned to modern components, increased the efficiency, and wrote a true-to-life output power rating on the label. Still, the AJ series models can’t be anything more than entry-level power supplies due to such reasons as the old version of the ATX standard they comply with and the rather noisy fan. The IP-P300AJ2-0 (or a system case with it) can be bought for a typical office computer. The 350W model doesn’t provide any real advantages over the 300W one.