As prescribed by the EPS12V and ATX12V 2.0 standards, the PSU has two +12V rails with independent over-current protection. Such protection is also installed on the other output lines (many PSUs have protection against an overshoot above the allowable total wattage, but not against over-current on some particular rails). You can see the six paired shunts in the photograph of the open PSU.
The cross-load characteristic of this PSU is perfect. Well, that’s exactly what we must expect from a circuit with dedicated voltage regulation. The load capacity of this PSU on the +5 and +12V rails is quite high by the measures of the EPS12V and ATX12V 2.0 standards.
The high-frequency ripple is small: less than 15 millivolts on the +5V rail and less than 50 millivolts on the +12V rail, the allowable maximums being 50 and 120 millivolts, respectively.
This PSU uses a high-quality 80mm fan from Nidec. Its speed is flexibly adjusted depending on the load. Cooling such a PSU requires a strong air stream so the fan speed is higher than 2000rpm even at small loads. The noise mostly consists of the hissing of the air – the buzz of the fan’s blades is hardly audible.
The efficiency factor of the FSP460-60PFN is average, amounting to almost 79% at full load. This is no record, of course, but a good number nonetheless against the other PSUs from FSP Group that don’t boast high efficiency. The power factor is as high as 94% thanks to the active correction. This is not a record, too, but much better than units with passive PFC have.
So, the FSP460-60PFN is an excellent power supply for entry-level servers as well as powerful workstations. It gives you high wattage and excellent load characteristics but at the expense of a rather loud fan. Another big plus of this model is the amazing length of its cables and numerous connectors. Owners of large system cases are going to appreciate this.