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How much power does the Power Supply really uses

Last response: in Components
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December 5, 2010 5:39:22 PM

Hi everyone,

I have a general question about how power supply work.

I have a 300W old power supply that i intend to use for a DIY NAS. My question is: if the power supply indicates that the power is 300W does that indicate that it will consume 300W all the time or is the Wattage consumption dependent on how many devices I connect to it.

Please let me know if my question needs clarity,

Thank you in advance,

-Jay

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a c 147 ) Power supply
December 5, 2010 5:43:55 PM

juno1 said:
Hi everyone,

I have a general question about how power supply work.

I have a 300W old power supply that i intend to use for a DIY NAS. My question is: if the power supply indicates that the power is 300W does that indicate that it will consume 300W all the time or is the Wattage consumption dependent on how many devices I connect to it.

Please let me know if my question needs clarity,

Thank you in advance,

-Jay


A PSU will draw only as much power as it needs.

How much it draws from the wall is affected by it's efficiency which is usually best in the middle of it's range. Cheap units are around 70% efficient, the best gold rated are around 90%
December 5, 2010 6:10:49 PM

geofelt said:
A PSU will draw only as much power as it needs.

How much it draws from the wall is affected by it's efficiency which is usually best in the middle of it's range. Cheap units are around 70% efficient, the best gold rated are around 90%


thank you very much Geofelt
!