On 28 Sep 2006 14:11:55 -0700, q_q_anonymous@yahoo.co.uk
wrote:

>
>Sergio T.P. wrote:
>> Hi all.
>>
>> I've bought a new 400 W power suply. It was supposed to be a silence power
>> suply. In fact, it is less noisy than my old one,
>
>actually that is to be expected. Higher wattage is supposed to be less
>noisy. The logic is that it can produce up to 400w because it is more
>efficient in that it producese less heat, so has less heat to remove.
>(so the fans needn't spin as fast).
>
>Maybe if the 400w PSU was also operating at 400w then it could be as
>loud as a 300w (operating at 300w). But I guess typically the 400w PSU
>won't be using all 400w. Especially not in a computer that ran with a
>300w.
>If you require 300w , then I guess whether you put a 300w or a 500w or
>a 700w PSU in there, you'll get 300w. 400w is better though, less
>strain on the PSU in intensive times.


That's not necessarily true. Sure, there are some newer PSU
that are often in high wattage ratings like 400W, these
higher wattage PSU have become more common and due to the
recent 80-plus initiative there are "some" that are more
efficent. There are also plenty of 400W PSU that are no
more efficient than 300W models.

Generally speaking, since the newer 300W models can be more
efficient (than preceeding models) too, we can generally
discount the wattage and still assume the 400W produces
more heat, IF the system is using that much more power, a
roughly 4:3 ratio more if all else were equal (which I doubt
would be true, but this just corresponding to the wattage).