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What is my system wattage? Is a 650W PSU enough, are PSUs with more wattage quieter?

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December 10, 2013 9:28:31 AM

I5 4670k Stock
R9 280x Vapor X Stock 1070Mhz
Z87 HD3 Mobo
1 TB HD
1 SSD
1 120mm fan (heatsink)
4 140mm case fans
4 x 4gb DDR3 RAM

My XFX 650W PSU was very loud under load (it was quieter but still the most audible part of my system when idle), it was by far the loudest component in my system, so I've RMAd it.

I'm getting sent a new one but I'm wondering I'll have the same problem - so many people are saying that the PSU is very loud after 50% loud, so if you want it quiet, you better get a much larger PSU. Is there any truth to this?
a b ) Power supply
December 10, 2013 9:34:52 AM

650W should be plenty and xfx is not a bad brand. the psu's are silent if they have a big 120mm or 140mm fan. you probly were unlucky and got one that was damaged during transport.

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a c 260 ) Power supply
December 10, 2013 9:36:50 AM
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curioususer123 said:
I5 4670k Stock
R9 280x Vapor X Stock 1070Mhz
Z87 HD3 Mobo
1 TB HD
1 SSD
1 120mm fan (heatsink)
4 140mm case fans
4 x 4gb DDR3 RAM

My XFX 650W PSU was very loud under load (it was quieter but still the most audible part of my system when idle), it was by far the loudest component in my system, so I've RMAd it.

I'm getting sent a new one but I'm wondering I'll have the same problem - so many people are saying that the PSU is very loud after 50% loud, so if you want it quiet, you better get a much larger PSU. Is there any truth to this?


Hi - There is some truth to it, however I think you prob just got a bad PSU.

The truth part is; a more powerful PSU than you need should run cooler as it won't be working as hard,
and if it's running cooler the fan will run less often which means less noise. Not too large tho, then efficiency could suffer as many (but not all) PSU's efficiency drops when the load is less than 20%.

So, if you're thinking 750w for that purpose,it'd be OK. With that sys even 850 is OK, as long as it's not
on idle most of the time. The additional upfront cost is a judgement call on your part.
Related resources
December 10, 2013 10:46:36 AM

toyftw said:


The truth part is; a more powerful PSU than you need should run cooler as it won't be working as hard,
and if it's running cooler the fan will run less often which means less noise. Not too large tho, then efficiency could suffer as many (but not all) PSU's efficiency drops when the load is less than 20%.



Does this XFX PSU depend on load or temperature? What is my system wattage, I can't seem to find a reasonable estimate.
December 10, 2013 10:55:16 AM

http://uk.pcpartpicker.com/p/2idzz

My system wattage comes out to be 477/650 Watts, this is 73% of the overall, isn't this stressing the PSU a lot? Is this why my PSU was loud before?
a c 260 ) Power supply
December 10, 2013 10:56:49 AM

curioususer123 said:
toyftw said:


The truth part is; a more powerful PSU than you need should run cooler as it won't be working as hard,
and if it's running cooler the fan will run less often which means less noise. Not too large tho, then efficiency could suffer as many (but not all) PSU's efficiency drops when the load is less than 20%.



Does this XFX PSU depend on load or temperature? What is my system wattage, I can't seem to find a reasonable estimate.


PSU functions based on load, it's fan is generally activated by the temperature.

Here is an online wattage calculator, like most it tends to build in some headroom:

http://www.extreme.outervision.com/psucalculatorlite.js...

December 10, 2013 11:06:31 AM

toyftw said:
curioususer123 said:
toyftw said:


The truth part is; a more powerful PSU than you need should run cooler as it won't be working as hard,
and if it's running cooler the fan will run less often which means less noise. Not too large tho, then efficiency could suffer as many (but not all) PSU's efficiency drops when the load is less than 20%.



Does this XFX PSU depend on load or temperature? What is my system wattage, I can't seem to find a reasonable estimate.


PSU functions based on load, it's fan is generally activated by the temperature.

Here is an online wattage calculator, like most it tends to build in some headroom:

http://www.extreme.outervision.com/psucalculatorlite.js...



Is PC parts picker not accurate? The website does not seem to be working for me.

a c 260 ) Power supply
December 10, 2013 1:00:13 PM

curioususer123 said:
toyftw said:
curioususer123 said:
toyftw said:


The truth part is; a more powerful PSU than you need should run cooler as it won't be working as hard,
and if it's running cooler the fan will run less often which means less noise. Not too large tho, then efficiency could suffer as many (but not all) PSU's efficiency drops when the load is less than 20%.



Does this XFX PSU depend on load or temperature? What is my system wattage, I can't seem to find a reasonable estimate.


PSU functions based on load, it's fan is generally activated by the temperature.

Here is an online wattage calculator, like most it tends to build in some headroom:

http://www.extreme.outervision.com/psucalculatorlite.js...



Is PC parts picker not accurate? The website does not seem to be working for me.



Hi - pcpartpicker calc is prob as good as any. Yeah, I had problem also with outervision.
Maybe try the Asus calc & compare to parpicker:

http://support.asus.com/PowerSupply.aspx?SLanguage=en

Like most it will suggest more power than you really need, but it is a good guide.

I found with my system, it suggested 100+ watts more than I really needed. The GPU mfgs do the same thing.
December 11, 2013 12:22:14 PM

toyftw said:
curioususer123 said:
toyftw said:
curioususer123 said:
toyftw said:


The truth part is; a more powerful PSU than you need should run cooler as it won't be working as hard,
and if it's running cooler the fan will run less often which means less noise. Not too large tho, then efficiency could suffer as many (but not all) PSU's efficiency drops when the load is less than 20%.



Does this XFX PSU depend on load or temperature? What is my system wattage, I can't seem to find a reasonable estimate.


PSU functions based on load, it's fan is generally activated by the temperature.

Here is an online wattage calculator, like most it tends to build in some headroom:

http://www.extreme.outervision.com/psucalculatorlite.js...



Is PC parts picker not accurate? The website does not seem to be working for me.



Hi - pcpartpicker calc is prob as good as any. Yeah, I had problem also with outervision.
Maybe try the Asus calc & compare to parpicker:

http://support.asus.com/PowerSupply.aspx?SLanguage=en

Like most it will suggest more power than you really need, but it is a good guide.

I found with my system, it suggested 100+ watts more than I really needed. The GPU mfgs do the same thing.


Installed my new PSU and it works wonders. It's very quiet, although noticeable if you concentrate, but the noise doesn't change during gaming either. :) 
a c 260 ) Power supply
December 11, 2013 2:10:48 PM

curioususer123 said:
toyftw said:
curioususer123 said:
toyftw said:
curioususer123 said:
toyftw said:


The truth part is; a more powerful PSU than you need should run cooler as it won't be working as hard,
and if it's running cooler the fan will run less often which means less noise. Not too large tho, then efficiency could suffer as many (but not all) PSU's efficiency drops when the load is less than 20%.



Does this XFX PSU depend on load or temperature? What is my system wattage, I can't seem to find a reasonable estimate.


PSU functions based on load, it's fan is generally activated by the temperature.

Here is an online wattage calculator, like most it tends to build in some headroom:

http://www.extreme.outervision.com/psucalculatorlite.js...



Is PC parts picker not accurate? The website does not seem to be working for me.



Hi - pcpartpicker calc is prob as good as any. Yeah, I had problem also with outervision.
Maybe try the Asus calc & compare to parpicker:

http://support.asus.com/PowerSupply.aspx?SLanguage=en

Like most it will suggest more power than you really need, but it is a good guide.

I found with my system, it suggested 100+ watts more than I really needed. The GPU mfgs do the same thing.


Installed my new PSU and it works wonders. It's very quiet, although noticeable if you concentrate, but the noise doesn't change during gaming either. :) 



Gr8! - Enjoy

December 12, 2013 2:47:58 PM

toyftw said:
curioususer123 said:
toyftw said:
curioususer123 said:
toyftw said:
curioususer123 said:
toyftw said:


The truth part is; a more powerful PSU than you need should run cooler as it won't be working as hard,
and if it's running cooler the fan will run less often which means less noise. Not too large tho, then efficiency could suffer as many (but not all) PSU's efficiency drops when the load is less than 20%.



Does this XFX PSU depend on load or temperature? What is my system wattage, I can't seem to find a reasonable estimate.


PSU functions based on load, it's fan is generally activated by the temperature.

Here is an online wattage calculator, like most it tends to build in some headroom:

http://www.extreme.outervision.com/psucalculatorlite.js...



Is PC parts picker not accurate? The website does not seem to be working for me.



Hi - pcpartpicker calc is prob as good as any. Yeah, I had problem also with outervision.
Maybe try the Asus calc & compare to parpicker:

http://support.asus.com/PowerSupply.aspx?SLanguage=en

Like most it will suggest more power than you really need, but it is a good guide.

I found with my system, it suggested 100+ watts more than I really needed. The GPU mfgs do the same thing.


Installed my new PSU and it works wonders. It's very quiet, although noticeable if you concentrate, but the noise doesn't change during gaming either. :) 



Gr8! - Enjoy



Sigh, it's still comparatively loud.

http://www.tomshardware.co.uk/answers/id-1926468/exchan...
!