As expected, the troll provides lots of babbling but no citations.
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Subject: Re: Why Pentium?
Date: Fri, 21 Jul 2006 17:46:22 -0400
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In other words, you cannot provide a citation.
In other words, it is common knowledge and you can easily
find this yourself via:
Google or any mainstream search service
Usenet search
Any fan manufacturer that makes lifespan projections
There are NO fan manufacturers that claim fluid bearing fans
have longer lifespan and most claim only (roughly) 50% of
the lifespan of dual ball bearings.
Which citation would you prefer? There are SO many, so
let's get your foolish arguments out of the way first so I
can provide the most applicable to dispell your
misunderstanding.
http://www.newegg.com/Product/Product.asp?Item=N82E16835185006
Sony fluid dynamic bearing 120 mm case fan. Has a 15,000 our
lifespan.
15,000 hour?
While that IS what the product page says, it's funny!
The funny part is you are clueless about fans. If you'd had
a clue, you would have realized that 15,000 hours is an
incredibly LOW lifespan for a fan, that the lifespan
projection for that product was supposed to be 150,000
hours.
They can make this questionable lifespan rating because of
two factors:
1) Assume ideal operating condition. IE- low heat
2) They base it on the low RPM. Usually fan manufacturers
spec a family of fans, including those with much higher RPM,
while the higher RPM fans have a lower actual lifespan than
the lower RPM of the same model. Similarly, any crap fan
can be taken out of context, selectively focusing on the
lowest RPM model and then suggesting a longer lifespan than
it actually has.
http://www.newegg.com/Product/Product.asp?Item=N82E16835186008
Arctic Cooling fluid dynamic bearing 120 mm case fan. Comes with a
six-year warranty.
That doesn't mean it has a longer lifespan, it means they've
overpriced it enough to offset any potential RMA issues. Do
you realize just how little a sleeve fan costs in volume?
It is trivial to them to replace it free, the shipping cost
is multiple times as much, but putting interest on their
profit, they can cover that too. Further, six years is
lower than the expected lifespan of a system.
Panasonic is a major manufacturer of fluid dynamic bearing fans, for
many years.
Yes, I'd already mentioned them as an exception. They do
NOT rate their fluid dynamic bearing fans as having a higher
lifespan than their dual ball bearing fans.
BTW, do us all a favor and stop with the nonsense about
"fluid dynamic bearings", as they are SLEEVE BEARINGS and
any other term is a senseless marketing gimmick.
More like teaching you a lesson.
You have enough ego to get your system's cooling into a bind
but nowhere near enough experience to teach.
I won't hold my breath waiting for citations you will never provide.
Don't you mean that you're just ignorant?
Seriously, you started a disagreement about fans yet you
think we need to provide a spec when you could have easily
read it yourself from any of the major manufacturers if you
had ever been to their websites and read the datasheets.
If it were new information, it'd be "news", but the only
thing new is that we became aware how ignorant you are about
fans. Anyone and their brother has known dual ball bearing
fans are at least as long lived, sometimes MUCH longer
lived.
These products you cite haven't even existed long enough for
you to pretend to have any experience with their actual
lifespans. It is impossible for you to have experience with
them, whether their projections actually hold true. So
you're an armchair quarterback who read marketing blurbs,
believed them, and didn't ever bother to test anything
yourself.