PSU efficiency savings calculator

Have you ever wondered exactly how much money you can save on high efficiency power supplies? Input the data of your own PSU and find out how much you'd save if it was more efficient.

Your PSU wattage:

Your PSU 80+ certification:

Cost of electricity in your area:
US cents per kWh

Select load scenario:
50% load for 3 hours daily, 20% load for 7 hours daily
100% load for 3 hours daily, 20% load for 7 hours daily
50% load for 10 hours daily
Full load 24/7

Yearly costSavings per year

# When buying a power supply, you should pay the most attention to the following characteristics:

  • voltage regulation
  • load regulation
  • ripple and noise
  • voltage stability under crossload
  • transient load reaction
  • working protections (OVP, UVP, OPP, OTP, OCP)
  • temperature rating
  • capacitors durability
  • fan bearing longevity

These and several more factors are the most important in a PSU, since they directly influence the well-being and lifetime of every part in your computer, and also the PSU itself. You shouldn't pick a PSU just because it is highly efficient - you should aim for a unit that provides clean power, built with components durable enough to withstand many years of operation. 

Sometimes, a Gold or Platinum unit will live for a shorter time than a good Bronze unit, because the former might have a low-quality fan that will fail fast, too high ripple that slowly damages its internal components (as well as other parts in the PC), or other disadvantages. Indeed the high efficiency PSUs generate less heat inside themselves, but an 80+ Bronze PSU with highly durable capacitors of a wide diameter and enough space around can still live longer than an 80+ Gold PSU with very poor caps or other defect - despite the fact that it generates less heat.

If you want to make an informed decision when buying a PSU, look for reviews on accurate sites such as TechPowerUP, Tom's Hardware, JonnyGURU, HardOCP, ComputerBase, KitGuru, PCPerspective, Hardware Insights, and other sites that have enough equipment and expertise to test the factors mentioned above. You don't need to understand the technical terms - the authors sum up their findings in an understandable way, so you know what you get.


TechPowerUP JonnyGuru ComputerBase PCPerspective KitGuru HWI #
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