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Only using 350Watts of a 1000Watt PSU  

post #1 of 20
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This is a noob question: does running a 350W system on a 1000W 80+ PSU waste more electricity than running it on a 400W 80+ PSU?
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Ol' Betsy
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post #2 of 20
The power supply will only draw the power it needs, not run at 1000W just because it is a 1000W PSU.
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post #3 of 20
Quote:
Originally Posted by ChrisTahoe View Post

The power supply will only draw the power it needs, not run at 1000W just because it is a 1000W PSU.

this is correct, it will only draw from the wall how much is used ideally smile.gif

but thats a lot of overkill tongue.gif
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post #4 of 20
But PSU's are more efficient at certain load %'s I'm pretty sure. It's possible. I think underloading a PSU is worse actually.
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post #5 of 20
PSU's tend to be more efficient closer to their rated capacity. But 350 w of a 1000 w is not too bad overall (depending on the psu)
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post #6 of 20
Quote:
Originally Posted by charlie310 View Post

This is a noob question: does running a 350W system on a 1000W 80+ PSU waste more electricity than running it on a 400W 80+ PSU?

It depends on the efficiency numbers of each individual PSU. A 400W PSU would be running at 87.5% load (not efficiency), a 1000W supply would be running at 35% load. If the efficiency of the 1000W supply was,say , 83% at 35% load, and the 400W supply was 81% efficient at 87.5% load, then the 1000W supply would actually draw less to run your system. If the efficiency numbers were reversed, the opposite would be true. You would really need to look at the efficiency at different load levels for each supply to compare. I think in reality though, you would only be talking about a few watts of a difference.
post #7 of 20
It really depends on the power supply models involved and how the computer is being used. What you're really interested is the efficiency of the power supplies running the loads you're using.

A 350W max system is going to be drawing a whole lot less than 350W most of the time, unless you have it maxed out running something like F@H all the time. If you're assuming that the computer is going to be on idle most of the time, a typical 400W model may be more efficient than a typical 1000W model, since most power supplies are not as efficient at lower loads like under 20%. 80+ cert only guarantees that some unit passed a certain efficiency load in their lab at a certain load pattern and low temperature, at 20%, 50%, and 100% loads.

But actually standard 80+ 1000W power supplies are pretty rare these days.
post #8 of 20
Quote:
Originally Posted by charlie310 View Post

This is a noob question: does running a 350W system on a 1000W 80+ PSU waste more electricity than running it on a 400W 80+ PSU?

Provided similar efficiency ratings, the answer is Yes.... however, your signature system hardly uses 300W, you won't see 350W no matter what you do with it(under air/water cooling).
post #9 of 20
absolutely not. The power supply wud only draw around 350w (u have to include factors like temperatures and duration of usage at one time).
    
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post #10 of 20
Quote:
Originally Posted by PCCstudent View Post

Guess you stayed away from fast cars.There is a lot worse that can happen with your PC than overkill in the selection of a power supply.Once you quit the corporate world you are free to get a little crazy at times.

and fast women too lol wink.gif
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