Articles: Cases/PSU

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Voltage Stability

The Turbo Series power supplies all have dedicated voltage regulation, so we can expect them to have green diagrams in this test.

That’s what we have with the first sample. The +12V voltage sags less than 3% even at the highest allowable load. The +5V and +3.3V voltages vary more, but do not leave the allowable limits at any loads, either. That’s an excellent result.

The 700W unit draws a splendid picture. None of the voltages deflects by more than 3% at any load.

The 750W model’s +3.3 voltage deflects by somewhat more than 3% (to remind you, 5% is the maximum allowable deflection), but the +12V rail keeps within a 1% deflection!

The 850W model is no worse than the others. Its voltages always remain within the allowable limits, the +12V rail keeping within a 1% deflection again.

Here, it is interesting to compare the different models between each other. As you can see, their parameters do not worsen as the load grows up. It means that the tested PSUs from Chieftec are indeed meant for loads up to 850W and you should not be set aback at the fact that the models with different wattage ratings are based on the same platform and use the same components.

Output Voltage Ripple

The junior model meets the high-frequency ripple requirements. The output voltage ripple is far below the permissible maximum even at full load.

It is interesting to note the difference between the 700W and 750W models: the oscillogram of the first unit resembles the one of the 650W model. The oscillogram of the second unit has a different shape of pulsation which is smoother, flatter. This is because these PSUs, although based on the same platform, have different output capacitors depending on the wattage rating.

The 850W model’s oscillogram is something in between: there are clear square impulses on the +5V and +3.3V rails like with the 700W model but the peaks of the “saw” are somewhat smoothed out on the +12V rail.

Well, these are all insignificant differences, actually. Like with the output voltage stability, the point is that each of the PSUs really copes with the load it is specified to support. Although each of them is based on the same platform, you can see that they are adapted to their specific maximum output power.

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