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High Power Astro PT 700W PSU Review

In order to provide you with the most professional and accurate reviews, we are using the following equipment to test the performance of power supplies:

  • Modified SECC steel case with thermal generation and control components installed
  • 8 Vantek electronic loads, USB controlled
  • Extech 380803 TrueRMS Power Analyzer
  • USB Instruments Stingray Oscilloscope
  • SL-5868P digital sound level meter
  • CompuLAB interface
  • MyPClab thermal interface
  • Labjack U3-HV interface
  • Custom calibration box
  • Custom software

More information about our testing equipment and methodology can be found in this article.


We were very curious about the actual electrical performance of the Astro PT 700W, as High Power claims that their Digital VRM could reduce voltage regulation down to 0.5%. Although we could not replicate a result as good as what the company claims this power supply could possibly do, our sample kept the voltage regulation between minimum and maximum load down to less than 1%, which is very impressive nevertheless. When it comes to ripple suppression, the Astro PT 700W unit performed well, reaching a maximum ripple of 46mV on the 12V line under maximum load.

Being an 80Plus Platinum certified power supply, we did expect the efficiency of the Astro PT 700W unit to be very high and we were not disappointed. The maximum efficiency of the unit reached 94% while it was powered by a 230VAC source and operating at 50% capacity, while the efficiency remains above 90% across the entire load range.

The thermal performance of the High Power Astro PT 700W unit is good, even considering the very high efficiency of the power supply, with linear behavior. Note that the fan of this power supply will not start if the unit operates at 20% load, therefore that reading was just the ambient air behind the power supply at the time.

When it comes to acoustics, the Astro PT 700W is entirely silent while operating within its nominal load range (30% to 70% capacity). Only at very high loads will the power supply become audible, reaching 35dB(A) under maximum stress. It is interesting to note however that at very low loads (20% and below) the Astro PT generates a humming electric noise, which actually is stronger than the noise generated by the fan once it starts at very low RPM. The humming noise would stop at 25% load and start again if the unit was overloaded above 105% capacity. It would appear that this power supply really dislikes operating outside its nominal capacity range, although the humming noise is nothing more than annoying.

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