PC power supply efficiency

In summary, the conversation is discussing the efficiency of modern 80 plus power supplies and what their quoted "87% efficiency" means. One person wonders if this means a Gold-rated 1000W PSU will provide the full 1000W to internal components, while the other person explains that power supplies are rated for their output power and may have limitations on the different voltages and loads. They also mention that the output rating should be considered approximate and may not always be able to provide the full 1000W to components.
  • #1
Hercuflea
596
49
Hi,

When the modern 80 plus power supplies are quoted as being "87% efficient" on 100% load, does this mean that an 80 plus Gold PSU rated at for example 1000 Watts will provide 1000 Watts to the internal PC components, and therefore draw 1000/(0.87) = 1149.43 W from the wall? OR does it mean that an 80 plus Gold PSU rated at 1000W will only supply 870W maximum to the internal components?
 
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  • #2
Hercuflea said:
does this mean that an 80 plus Gold PSU rated at for example 1000 Watts will provide 1000 Watts to the internal PC components, and therefore draw 1000/(0.87) = 1149.43 W from the wall?
Yes, it should (by definition) do so. Whether it really does, is another question.
 
  • #3
Power supplies are rated for their output power. But, since there are multiple voltages (and multiple loads) the output rating is generally a combination of loads that make the supply look good. I don't know how realistic the ratios (say ratio of 3.3V power to 12V power) are, so it's best to consider the output rating to be approximate.
 
  • #4
Like meBigGuy says not all combinations apply. There should be an indication in the manual and frequently on the label what those limitations are (often in amps not watts). I would be skeptical if
1000W can be drawn by actual pc components.

BoB
 

What is PC power supply efficiency?

PC power supply efficiency is a measure of how well a power supply converts AC (alternating current) power from an electrical outlet into DC (direct current) power that is usable by a computer's components. It is represented as a percentage, with higher percentages indicating a more efficient power supply.

Why is PC power supply efficiency important?

Efficiency is important because it affects the performance and lifespan of a computer. A more efficient power supply will waste less energy and generate less heat, resulting in better overall performance and potentially extending the life of the components.

How is PC power supply efficiency measured?

PC power supply efficiency is measured using a standardized test called the 80 PLUS Certification. This test measures the efficiency of a power supply at different loads (20%, 50%, and 100%) and assigns a corresponding efficiency rating (80 PLUS Bronze, Silver, Gold, Platinum, or Titanium).

What is a good PC power supply efficiency rating?

A good efficiency rating for a PC power supply depends on the needs and usage of the individual computer. Generally, anything above 80% is considered good, with higher percentages being even better. It is important to choose a power supply that is appropriate for the power needs of your specific computer.

Does a higher PC power supply efficiency rating mean it will use less energy?

Yes, a higher efficiency rating means that the power supply will use less energy from the electrical outlet to power the computer's components. However, it is important to note that a higher efficiency rating does not necessarily mean a lower electricity bill, as it also depends on the overall energy consumption of the computer and its components.

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