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Re: OT - power off probs

On Tuesday 27 December 2005 20:12, Piers Kittel wrote:
>Even tho it's only about a year old?
A year old psu can have 4 oz of dust bunnies in it, completely blocking 
any air flow.  This user said there was only one fan, the one on the 

Now, I've never seen although there may well be, an example of a 
fanless psu, but at 240 watts rated, & say 95% efficiency (thats being 
very very charitable BTW, most are hard put to make 90%) then thats 
still 12 watts of heat to get rid of by whatever means.  With no fan 
that assumes good radiant efficiency, and good thermal condutivity to 
the outside world else something is going to get too hot to work.  And 
once an overheat has shut one of these things down (if its not a 
catastrophic shutdown where the magic smoke comes out) then whatever 
caused the shutdown is going to become ever more sensitive to over 
temps, turning itself into a nuisance rather quickly.

With decent psu's being commodity items, carefull shopping will buy you 
a case of 24 300 watters from the pacific rim people at less than a 
$20 bill each including shipping.  I usually go for the even bigger 
stuffs, 450-600 watts rated because they'll have 2 fairly quiet, ball 
bearing rated fans in them, often thermostaticly controlled & running 
easy, and will last for many years.  But they ALL will benefit from an 
annual blow job administered by a 100+ psi air hose.  That one point 
will extend their working life by 3 to 10 times depending on how much 
dust they manage to trap.

Who am I to sound like an expert when I don't even have a briefcase?
Just a semi-retired old fart who's been chasing electrons for a living 
since about 1948.  The last 21 years as the CE at a TV station here in 
WV.  Semi-retired because I'm still doing it part time.

Cheers, Gene
People having trouble with vz bouncing email to me should add the word
'online' between the 'verizon', and the dot which bypasses vz's
stupid bounce rules.  I do use spamassassin too. :-)
Yahoo.com and AOL/TW attorneys please note, additions to the above
message by Gene Heskett are:
Copyright 2005 by Maurice Eugene Heskett, all rights reserved.

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