Archived from groups: alt.comp.hardware.pc-homebuilt,alt.comp.hardware.homebuilt (
More info?)
On Fri, 08 Oct 2004 15:47:35 GMT, Al Smith
<invalid@address.com> wrote:
>>>Home builders almost always overstate the need for a large power
>>>>supply. If it works, it is big enough. If it works, it will work
>>>>just as well as a 500 W power supply, but with less heat and noise.
>>
>>
>> Huh?
>>
>> Typically a decent higher wattage PSU has larger heatsinks
>> and better fan control, it will be cooler and quieter unless
>> ill-designed (on average it would be at least cooler or
>> quieter if not both).
>
>I grant you this might be the case -- but only because you won't
>find a really shoddy 500 W power supply that easily. People who
>buy 500 W power supplies want quality. However, it stands to
>reason that a 500 W power supply of the same quality as a 300 W
>power supply is going to generate more heat. As for noise, that
>depends on the quality of the fan, and on its diameter.
Unfortunately there are a lot of poor 500W, for example
http://www.google.com/froogle?q=500W+ATX&btnG=Search+Froogle&scoring=p
It does not stand to reason that a 500W will generate much
more heat, perhaps it's a couple percent less efficient, but
that's hardly significant if the system would've ran from
300W anyway, lower system power usage makes percentage
difference even less meaningful.
Noise may depend on quality of fan after it's worn out, but
initally it can depend more on how much time and thought was
put into engineering the fan control circuit. Take a PSU
with relatively quiet fan, typical single 80x25mm size, and
swap in a cheap junk fan of similar amperage rating, and
it'll still be quiet due to the integral fan speed
controller.