Alas, the power supply only lasted a couple of minutes under a load of 420W. After that time, the transistors of its inverter died with a loud plop. In-Win was overoptimistic declaring an output power of 430W for this product.

At a load of 350W there is a voltage ripple of 55 millivolts on the +12V rail and 23 millivolts on the +5V rail. There’s only high-frequency pulsation here.

The cross-load diagram looks quite good. If power consumption of today’s computers were like the ATX12V 1.3 standard implies, it would fit into the “green zone”. But modern computers put a heavy load on the +12V rail, so the +5V voltage is going to be too high, although within permissible limits.

An ARX FD1212-S3142E fan is installed in this power supply.

The speed of the fan is varied from 1050-1100rpm under low load to 1800rpm at a 350W load. The PSU has moderate noisiness. Its fan is audible even at low loads, but I guess quite a lot of users wouldn’t find its noise loud or irritating.

The PSU’s efficiency is 76% at the maximum and declines to 70% (which is the allowable minimum demanded by the ATX12V 1.3 specification) at high loads. Well, this unit can’t work more than a couple of minutes at such a load anyway.

So, the IW-P430J2-0 has produced predictable results in my tests. It could be called out-dated a year ago, but now it is downright obsolete. Major PSU makers do not produce products of an ATX12V version lower than 2.0 anymore. Priced at $40, this PSU finds itself in the same category with, say, FSP’s ATX-400PAF/PNF models that have similar characteristics but are fully ATX12V 2.0 compliant and can yield their full declared power of 400W without problems.

Unfortunately, In-Win isn’t just selling a boxed version of the IW-P430J2-0, but is also installing it into many system cases. This PSU is far from a good choice if you want to build a more or less powerful computer in such a system case.