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Power Supply Question



 
 
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  #1  
Old August 13th 12, 05:51 PM posted to alt.comp.periphs.videocards.nvidia
Pugsley
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Posts: 2
Default Power Supply Question

If a card requirements say 400w will it work with a 375 psu? Is 25w
that important?
  #2  
Old August 13th 12, 06:39 PM posted to alt.comp.periphs.videocards.nvidia
Le Forgeron[_2_]
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Posts: 8
Default Power Supply Question

Le 13/08/2012 18:51, Pugsley nous fit lire :
If a card requirements say 400w will it work with a 375 psu? Is 25w
that important?


If the card alone states 400w, how are you to only have a missing 25w ?
The CPU alone would use between 50 and 130W.
Each spinning disk is about 10W on average, peak on activity might double.

So, a 375 W PSU is already short of at least 100W.

Would it boot ? Yes, because the graphic card does not need 400W for Bios.
Would it start the OS ? probably.
Would it allow you to use a wordprocessor ? maybe.
Would it survive a bit of web surfing ? as long as no flash is around, sure.
Will you be able to use the card in most game ? no, the security of the
PSU will stop your computer, or if there is no security, you will
destroy it.
Could you use latest effects of the OS ? neither.

Notice about overcharging a PSU: the bad thing that might happen is
unregulated tensions (3.5V, 5V and 12V going to random values due to the
high charge): you might kill more than the PSU.

You know your computer, compute your need:

http://extreme.outervision.com/psucalculatorlite.jsp

  #3  
Old August 13th 12, 06:48 PM posted to alt.comp.periphs.videocards.nvidia
Pugsley
external usenet poster
 
Posts: 2
Default Power Supply Question

Thanks. Didn't realize all that. So Should I get a 500W?


Le 13/08/2012 18:51, Pugsley nous fit lire :
If a card requirements say 400w will it work with a 375 psu? Is 25w
that important?


If the card alone states 400w, how are you to only have a missing 25w ?
The CPU alone would use between 50 and 130W.
Each spinning disk is about 10W on average, peak on activity might double.

So, a 375 W PSU is already short of at least 100W.

Would it boot ? Yes, because the graphic card does not need 400W for Bios.
Would it start the OS ? probably.
Would it allow you to use a wordprocessor ? maybe.
Would it survive a bit of web surfing ? as long as no flash is around, sure.
Will you be able to use the card in most game ? no, the security of the
PSU will stop your computer, or if there is no security, you will
destroy it.
Could you use latest effects of the OS ? neither.

Notice about overcharging a PSU: the bad thing that might happen is
unregulated tensions (3.5V, 5V and 12V going to random values due to the
high charge): you might kill more than the PSU.

You know your computer, compute your need:

http://extreme.outervision.com/psucalculatorlite.jsp


  #4  
Old August 13th 12, 06:52 PM posted to alt.comp.periphs.videocards.nvidia
Paul
external usenet poster
 
Posts: 13,364
Default Power Supply Question

Pugsley wrote:
If a card requirements say 400w will it work with a 375 psu? Is 25w
that important?


The specification is a lie.

The card does not use 400W for itself.

That is an estimate for the entire computer.

You can compute the real power requirements for yourself.
Xbitlabs.com has done actual power measurements for cards,
so we can get something closer to a correct value. There
is an example here, of information for a 9800 GT video card.

http://www.xbitlabs.com/articles/gra...t_5.html#sect0

"83.2 watts (measured)"

If xbitlabs.com doesn't have a power measurement (and, they've
stopped doing them), then you use the estimated value from
gpureview.com instead.

http://www.gpureview.com/GeForce-9800-GT-card-575.html

"105 watts (estimated)"

If you add together the power requirements for each component
in the computer, you can then determine whether the power
supply is adequate or not. Say you have a 95W processor, some
12W hard drives, a 50W motherboard. You can add them together,
to get total power (95+12+12+50 + 83.2 = 252.2 watts).

Paul
  #5  
Old August 14th 12, 06:29 PM posted to alt.comp.periphs.videocards.nvidia
Homer Jay Simpson[_3_]
external usenet poster
 
Posts: 26
Default Power Supply Question

"Paul" wrote in message
...
Pugsley wrote:
If a card requirements say 400w will it work with a 375 psu? Is 25w
that important?


The specification is a lie.

The card does not use 400W for itself.

That is an estimate for the entire computer.

You can compute the real power requirements for yourself.
Xbitlabs.com has done actual power measurements for cards,
so we can get something closer to a correct value. There
is an example here, of information for a 9800 GT video card.

http://www.xbitlabs.com/articles/gra...t_5.html#sect0

"83.2 watts (measured)"

If xbitlabs.com doesn't have a power measurement (and, they've
stopped doing them), then you use the estimated value from
gpureview.com instead.

http://www.gpureview.com/GeForce-9800-GT-card-575.html

"105 watts (estimated)"

If you add together the power requirements for each component
in the computer, you can then determine whether the power
supply is adequate or not. Say you have a 95W processor, some
12W hard drives, a 50W motherboard. You can add them together,
to get total power (95+12+12+50 + 83.2 = 252.2 watts).

Paul


A couple of other review sites that actually measure the power consumption
of video cards a

http://www.techpowerup.com/reviews/?...ry=Video+Cards

and this German review site that you can run through a translator, if
necessary:

http://ht4u.net/grafikkarten/



 




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