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efficiency in psu

Last response: in Components
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November 7, 2007 12:44:55 AM

hi .
when you buy a psu, do you look at efficiency??
what is efficiency has to do with psus??

More about : efficiency psu

a b ) Power supply
November 7, 2007 3:28:01 AM

jhyukkang said:
hi .
when you buy a psu, do you look at efficiency??


Yes.


what is efficiency has to do with psus?? said:

what is efficiency has to do with psus??


The higher the efficiency, the less electricity is wasted as heat, the lower the actual electricity drawn from the A/C outlet will be.

Example: All the component in a PC will draw a total of 300w at full load.

PSU #1: 70% Efficiency - Actual power draw from A/C outlet = 300w/70% = 428.5w = 128.5w wasted as heat.

PSU #2: 85% Efficiency - Actual power draw from A/C outlet = 300w/85% = 352.9w = 52.9w wasted as heat. slightly lower electricity bill too.
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