Paul news Jan 2018 13:54:28 GMT in alt.windows7.general, wrote:

wrote:
OK, I'm not harvesting anything !

I guess you can listen here :

https://instaud.io/1Dd5

I chopped the very end off the recording and normalized it.
Just to bring up the level a little bit. Maybe I should
have companded it, and really cranked the level :-)

https://instaud.io/1DdB

CPU fan speed is register controlled. If a Dell computer
crashes, the fan can be heard running like a hoover,
because then there is nothing to turn down the fan speed
after the power is applied.

I've noticed that some Dells specifically will when first powered up
will run the CPU fan at or near full speed. Which seems to be the
case here.

I've got a vostro 410 sitting a couple of desks over that does the
same thing. I can't say it's unique to Dell, but, I don't run across
many other system builds that fire their fans on full on initial hard
start, either.

The result is, when machines like a Dell start up, there
will be a second or two delay during POST where the
CPU fan speed hasn't been set yet. Once the POST
gets to that point, the CPU fan can be properly
adjusted for the amount of thermal present at
that point in time.

Aye. My other systems, which are clones, don't crank their fans to
full speed on startup, but they will/do adjust speed based on need as
the machine heats up.

I'm guessing that's a fan noise, but it could just
as easily be a disk drive (judging by the "OK" sound
it makes nearer the end of the recording). It could be
that the fan stops rumbling on its bearings,
after the voltage applied via PWM is reduced a bit.

Nah, listen closer. That's no HD sound. That's a fan. I know the
sound you're thinking of too, and that's not it.

While you can peel the label back on some fans, and put
oil on the bearing, not all fans actually have an open
bearing. A Panaflo for example, you can't oil it because
the FDB bearing is sealed.

Most likely, this won't be an oil friendly fan.

Ball bearing motors get noisy as they get older. In
fact, a user is likely to replace the fan due to the
noise level, before it ever gets a chance to seize up
or something. I have disk drives with ball bearing
motors, that I can no longer sit next to, as they're
that loud. And the drive still works...

Yes, but, would you trust important data on them? I'd be making sure
I had backups once a drive gets that loud. You know it's the spindle
motor with some age on it, but, as you also most likely know, it
doesn't require a total failure to make your ability to access data
go bye bye.

Replacing the main fan on a Dell can be difficult,
due to the five pin interface. Regular PC fans
come in two, three, or four pin varieties. But
Dell decided five was a nice round number, and the
first question I get is "what can I put in here?".
Well, there was a supplier of replacement hoovers
for Dell, but there's no guarantee they're still
in business.

It's tach2 depending on the pinout spec you read. They are PWM style
fans, vs the older ones that provided tach readout (or none) and let
the mainboard alter incoming voltage to the fan to control it's
speed. In the case of the two pin fans, obviously the mainboard has
no control over the fan and the fan just runs wide open; but you
likely won't see those around much anymore.


With PWM, it's a pulse instead. If it gets a pulse, the fan gets full
power. No pulse, no power. It's a more efficient way to control fan
speed, by the pulses per second you send it vs trying to regulate
voltage to the fan motor. You just keep 12 volts hot, but, the fan
can't use it if the pulse isn't present. And you can control how fast
the fan runs by how often you pulse it.

You can bypass the fifth pin, since you already have another pin
providing tach readout, anyway. What you can't do with those fans is
bypass the pwm signal. If you did, the fan wouldn't ever run.

http://pinoutguide.com/Motherboard/d...n_pinout.shtml

This converts the 5pin to 4pin configuration while keeping fan
control in the hands of your Dells mainboard. Dell likes to be non
standard in various respects and of course, that includes (depending
on Dell model) the pin layout.

Or, if you'd prefer to have a 5pin fan because you think your Dell
might actually use all five pins and you're losing something if you
don't a quick online search will provide them.

If it's working now, you have nothing to worry about :-)
The above is just a backgrounder for you, for the
next time it happens.

I disagree... The fan is showing signs of failure at full speed. At
lower speeds, you don't hear it, but, that doesn't mean the fan is
continuing to operate within spec due to the failing bearing you can
clearly hear at full speed. The fan should be replaced. It's not
something to just ignore and live with. You preferably don't want to
have to replace a fan because it actually went out on you, as by
doing so, you've actually ran your cpu hotter over time than it would
have otherwise been run. Heat causes premature failures on
electronics. You can damage various levels of cache on the cpu by
running hot for too long and you may not even notice right away
you've harmed the cpu, until you open that one app that taxes it,
which used to run just fine, and now bluescreens your machine.

AMD socket 7 chips used to be real bad about this. You could toast
the l2 cache and not notice you had a problem right away. As the
computer would bootup as you'd expect, but, depending on the apps you
tried to open, would bluescreen and crash out on you. You actually
had a cpu level damaged system which wasn't stable, but, the
stability issue wouldn't crop up just by booting windows.



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