In-Win Commander 750W PSU

Results

In-Win's 750W Commander performance is really very good - hitting nearly 83 percent efficiency at idle (20 percent) load, then rising to a solid 86 then huge 88 percent efficiency at 50 to 75 percent load respectively, then finally dipping back to 84 to 85 percent efficiency at 100 percent load. Typically this idle value has matched the Cooler Master UCP 900W, but is a percent lower than the Antec Signature 850W.

Since PSUs should be spec'd and bought to load them between 50 (to 75) percent when running at full pelt, 86 to 88 percent efficiency will go further minimise the power pulled from the wall - this is a very competitive efficiency.

All the rails provided a solid result and were generally stable, with only the 12Vs dropping a bit under 100 percent load. The PFC falls out of the 80Plus spec at 20 percent load though, where it drops just a shade below the all important 90 percent, however increasing the PSU load sees it increase respectively to between 96 and 98 percent.

During the test at 20 to 50 percent load, the fan noise was barely audible making it extremely quiet, with just a little cool air being expelled from the back. At 75 percent load there is still only a small amount of air shifted with the fan at very low speeds, remaining very quiet, but it now begins to warm slightly. At 100 percent load there's finally a lot more airflow, but no bearing noise and the fan is certainly noticeable but still quiet - it's all air circulation only.

Understandably, there's warm air out the back but the casing generally remains cool to touch. Left on to cook for a while at full load, we found that proportional to fan speed there's very little air shifted out the back - this is mostly because half the fan has a plastic sheet trying to force the air in towards the back before escaping. As a consequence, like the Corsair TX750W, a lot of air is simply pushed straight back out and while quiet, it's louder than it should be.

Finally, In-Win has designed the Commander to keep the fan on after the PSU has been turned off - this is a technique sometimes used to additionally cool the hot components faster post shutdown with the aim of extending their life.