The FSP Hydro G 750W Power Supply Review

Cold Test Results

For our PSU testing we are using high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M 40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs - 2014 Pipeline post.

The conversion efficiency of the FSP Hydro G 750W at room temperature is very good, with the PSU surpassing 92.1% at 50% load. It also has an average of 90.8% within the nominal load range (20% to 100% of the unit's capacity). The efficiency is relatively stable across the nominal load range and only degrades significantly when the PSU is very heavily loaded, but it always remains well within the 80Plus Gold certification limits.

FSP has designed the Hydro G to minimize the use of the active cooling in order to keep noise levels down, similar to zero fan speed idle features we've seen in other classes of PC components. As a result, PSU's fan will not spin at all when the load is very low, only finally spinning up when higher loads call for greater cooling. At room temperature, the fan of our sample started spinning when the load was exactly 300 Watts, albeit very slowly. The fan's speed did not increase significantly beyond that point either, with the Hydro G generating perceptible levels of noise only when fully loaded.