In-Win IW-ISP350J2-0

This model is located a step higher in the In-Win product range. It differs from its predecessors in its electrical parameters as well as in the design. First, it complies with the ATX12V 1.3 standard (which mainly differs from version 1.2 in having a higher allowable current on the +12V rail – 18 amperes, to be exact). Second, it is equipped with a 12cm fan for quieter operation. The fan’s grid protrudes a little from the PSU’s case – this may be an obstacle to installing it into some system cases (for example, this grid will press against a stiffness rib in HEC/Compucase/Ascot cases, preventing you from putting the PSU in its place).

The unit follows the typical PSU design without additional regulation of the output voltages. It is based on an IW1688 regulator. The line filter is complete. There are two 560µF capacitors on the PSU’s input. The shape of the heatsinks has changed: they have become thicker, with four short ribs (two ribs on each side of a heatsink). Although the fan is attached to the top panel, there are vent holes in the front panel of the PSU – it means that some portion of the warm air will be blown back into the computer’s system case.

We got a model without power factor correction for our tests, but a passive PFC version, IW-ISP350J3-1, is currently selling, too. Like with the above-described ISP300 series units, there’s no other difference between the J2-0 and the J3-1.

The manufacturer again misleads the user: the name of the PSU and the information on the manufacturer’s website seem to imply an output power of 350W, but the label says different. In reality, the sustained load power of this PSU is 300 watts because the maximum allowable load power on the +5V, +12V and +3.3V rails cannot exceed 285W.

The load currents of the PSU surpass the standard a little: the allowable currents on the +5V and +12V rails comply with the older ATX12V 1.2 standard, while the newer, version 1.3 standard reduced these currents.

The PSU offers the following connectors:

• A 20-pin ATX connector on a 40cm cable
• A 4-pin ATX12V connector on a 42cm cable
• Two cables with one SATA power connector and two PATA power connectors (42cm from the PSU to the first connector (SATA), then 8cm more to the second connector and once more 20cm to the third one)
• One cable with two PATA connectors and one floppy mini-plug (25cm+15cm+20cm)

As you can see, the unit has got two SATA power connectors, and the cables themselves have become longer.