Every typical PSU design takes an overall performance hit when it operates in a hot environment. The FSP Hydro PTM X Pro displayed very high resistance to higher temperatures, with miniscule efficiency drop figures. The drop is an average of just 0.4% across the nominal load range and changes insignificantly when the PSU is fully loaded, suggesting that there is very little to no thermal stress.

The internal temperatures of the Hydro PTM X Pro are very low compared to any high output PSU operating in our hotbox. Although the temperature readings are on the heatsinks and not on the components themselves, these are amongst the lowest we have ever recorded from our testing of high output units and yet another indication that the engineers steered the design greatly towards reliability over everything else.

As expected, the hot environment changed the cooling profile of the Hydro PTM X Pro significantly. The cooling fan is relatively quiet when the load is very low but its speed will start increasing when the load goes above 200 Watt. The fan’s speed and, in extend, the noise increases almost linearly between 200 and 900 Watt load, at which point the fan reached its maximum speed. It is worthwhile to mention that the fan reached its maximum speed at a load much higher and while maintaining far lower operating temperatures than FSP’s 80Plus Gold certified unit.

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