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Can someone explain how 80+ efficiency in PSU's work?
boneeye
So I am planning to buy a new PSU and heard about this 80+ thingies about the power supplies. I don't really get what they are talking about. I only know that there is a somewhat change in the electricity bill if you have a more efficient power supply. Can someone explain it to me?
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More about explain efficiency psu work

Supposedly if your PSU draws so many watts from the source it is plugged into, it will output at least as much as 80% of that.
Just for example if the PSU draws 100 watts, it will be outputting to your system at least 80 watts of power. Figures used just as an example.
Lot's of non 80+ PSU's waste a lot of power.  solved Someone can explain how it works a two +12V rail design of a normal PSU?
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The 80 PLUS performance specification requires power supplies in computers and servers to be 80% or greater energy efficient at 10, 20, 50 and 100% of rated load with a true power factor of 0.9 or greater. This makes an 80 PLUS certified power supply substantially more efficient than typical power supplies.
Efficiency. 
Check these sources for more info:
http://en.wikipedia.org/wiki/80_Plus
http://www.hardwaresecrets.com/article/Understandingthe80PlusCertification/742 
Best answer
boneeye said:So I am planning to buy a new PSU and heard about this 80+ thingies about the power supplies. I don't really get what they are talking about. I only know that there is a somewhat change in the electricity bill if you have a more efficient power supply. Can someone explain it to me?
Hi  The other posters pretty much summed it up. The PSU supplies the DC power your components
require at a given point in time. Efficiency refers to how much AC power it needs to pull from the power
grid (wall socket) to convert & deliver the DC power needed.
Example; Your PC components need 300watts DC, at 75% efficiency the PSU will pull 400w from the wall,
at 80% efficiency the PSU will pull 375w from the wall, and at 85% it will pull 353w from the wall.
So, yes higher efficiency will reduce your electric bill, but generally it would take years not month's to recoup the cost difference.
A better reason to buy a more efficient unit is that it required a better design platform to achieve it's higher efficiency
and other things being equal should be a better product. 
http://www.plugloadsolutions.com/80pluspowersupplies.aspx#
Power supplies are the devices that power computer, servers and data center devices. They convert AC power from electric utilities into DC power used in most electronics. The 80 PLUS® performance specification requires power supplies in computers and servers to be 80% or greater energy efficient at 10, 20, 50 and 100% of rated load with a true power factor of 0.9 or greater. This makes an 80 PLUS certified power supply substantially more efficient than typical power supplies.
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