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

curioususer123 · Dec 10, 2013

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?

laviniuc · Dec 10, 2013

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.

toyftw · Dec 10, 2013

curioususer123 :

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.

curioususer123 · Dec 10, 2013

toyftw :

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

curioususer123 · Dec 10, 2013

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?

toyftw · Dec 10, 2013

curioususer123 :

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.jsp

curioususer123 · Dec 10, 2013

toyftw :

curioususer123 :

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.jsp

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

toyftw · Dec 10, 2013

curioususer123 :

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.

curioususer123 · Dec 11, 2013

toyftw :

curioususer123 :

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.

toyftw · Dec 11, 2013

curioususer123 :

toyftw :

curioususer123 :

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

curioususer123 · Dec 12, 2013

toyftw :

curioususer123 :

toyftw :

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/exchanged-xfx-650w-pro-due-noise-satisfied-loudest-component-system.html

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

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