Articles: Cases/PSU

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Cross-Load Voltage Stability

The +12V rail is perfect with both AXi PSUs but the other voltages fluctuate more than in the Seasonic-based AX series models. On the other hand, the deflection of 3% (and even 2% throughout the larger part of the load range) is quite acceptable.

Output Voltage Ripple

Like the previous pair, the AXi PSUs behave similarly in this test, so we only show you the results of the higher-wattage model.

The high-frequency voltage ripple is comparable to that of Corsair’s Seasonic-based PSUs even though this Flextronics-based PSU has less electromagnetic shielding.

The AXi series PSU are even better in terms of the low-frequency voltage ripple than their AX series counterparts.

Temperature and Noise

The PSU is cooled by a 120x120x25mm Yate Loon fan (part number: D12BH-12, rated speed: 2300 RPM) which is partially covered with a piece of plastic to optimize air flows.

As opposed to the AX series, the AXi PSUs only have one operation mode for their fan, which differs from both the Normal and Hybrid modes of the AX series.

The fan is idle at low loads. It wakes up at a load of 300-400 watts (i.e. sooner than in the AX series PSUs) and accelerates in a linear manner right away. The start speed is only 400 RPM. The top speed (at full PSU load) is about 1250 RPM, so the AX760i and AX860i are not louder than their AX series counterparts.

We guess that they are less attractive in terms of noisiness, however, because their fan works at a higher speed than in the AX series PSUs at loads of 600 to 800 watts. On the other hand, the Corsair Link feature allows to adjust the speed of the fan, unlike in the Seasonic-based models.

Efficiency and Power Factor

The AX760i was 91.2%, 94.2% and 92.5% efficient at loads of 20%, 50% and 100%, respectively. Its peak efficiency of 94.5% was observed at a load of 402 watts.

The AX860i was 91.3%, 93.9% and 90.7% efficient at loads of 20%, 50% and 100%, respectively. It reached its peak efficiency of 94% at a load of 433 watts.

Thus, these Flextronics-based PSUs are overall more efficient than their Seasonic-based counterparts – by 1% at medium loads. The latter are better in efficiency at low loads, though.

The power factor is over 99% at loads above 50% with both PSUs and reaches 99.8% at full load.

Standby Source

The standby source copes with its job well enough, yet the voltage drop at full load is about 4% compared to 2% of the AX series PSUs.

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