kony wrote:

> On Tue, 16 Aug 2005 08:52:47 -0500, Analabha Roy
> <daneelNOSPAM@physics.utexas.edu> wrote:
>
>>
>> Can anybody say anything about that with these specs?
>>
>>http://www.coolmaxusa.com/productDet...ategory=single
>>
>>
>
> That they're peak ratings, not sustainable. Essentially
> they use questinable methods to determine those numbers and
> if other name-brand manufacturers used similar methods,
> their "400W" psu would be rated higher than 400W.


That's a good point I guess...

But what is a psu exactly? Isn't it just a step-down transformer with some
pots in it to regulate voltage? I mean, it doesn't actually supply any
power, right? That comes from the mains. The 'sustainability' would have to
be more dependent on material properties (if the impedance changes too much
as it gets hotter and if subsequent cooling reverses the trend)like
resilience and stuff. If that is true, then the only manufacturing
difference between a high power and low power psu is in the materials that
make the magnetic core, maybe the CPM of the fan, the # of coils in the
transformer and other similar such. Those should be individually measurable
and benchmarkable, and there should be documentation on the web about ideal
parameters and one should be able to compare them.

Let me know what you think. Also, if you do know of some urls where they
have additional info, I'd be interested in reading it.


Thx,
AR