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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Pi-FAN for RPi4 with 4 (instead of 3) cables?
Date: Mon, 9 Dec 2024 17:37:34 +0000
Organization: A little, after lunch
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On 09/12/2024 17:27, David Higton wrote:
> In message <vj6i1l$c6u2$4@dont-email.me>
>            The Natural Philosopher <tnp@invalid.invalid> wrote:
> 
>> On 08/12/2024 19:50, David Higton wrote:
>>> In message <vj1d28$31v9g$12@dont-email.me>
>>>             The Natural Philosopher <tnp@invalid.invalid> wrote:
>>>
>>>> It's an interesting thought as to why one would use a fan at all. If
>>>> its such a high compute task that you need one, maybe a bigger Pi or an
>>>> Intel based machine is indicated.
>>>>
>>>> I dislike fans. They fail.
>>>
>>> PC fans run pretty much all the time.  A fan on a RasPi is likely to run
>>> less of the time, and could well last longer overall.
>>>
>>> Fans fail.  Disc drives fail.  SSDs fail.  Batteries fail.  Reservoir
>>> capacitors fail.  But before they do, they are very useful.
>>>
>>
>> Such an ArtStudent™ view of life.
>>
>> Do you know what MTBF means?
> 
> Yes.  Something I don't understand, though, is why so many people use
> the term MTBF when the appropriate one would be MTTF, since so few of
> the things referred to are repaired.
> 
That phrase was not used when I studied electronics.

Mind you, then everything was repairable.

I think its pretty academic when you are talking about consumer shit

It has to be expensive to be worth repairing.

I messed up a pi Pico  I thought about spending hours fixing it and 
spent a minute ordering a new one and threw the old one in the bin

When I was managing servers no one cared what went wrong, only that it 
had. Whether it was something we could fix - like putting in a new hard 
drive, Ram SIMM or a fan - or something we wouldn't bother with - like a 
new motherboard

IN operational terms the lifetime of the fan IS the mean tine between 
failures of the computer  if its the thing that goes the most often. 
And in many cases it was - fans, hard drives and RAM chips.

All were a bit likely to develop issues in under 5 year timescales

These definitions are academic.

The MTBF <= the shortest MTTF in the component list...


-- 
“It is dangerous to be right in matters on which the established 
authorities are wrong.”

― Voltaire, The Age of Louis XIV