New cpu fan lower rpm

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I just changed out my cpu fan which is on a AMD processor.  This fan was
running ~4500 rpm.  The cpu temp was running ~ 115F.  I changed the fan
out because it was terribly loud.  I am a little worried because the new
fan is running ~2500 rpm and temp is up to 140F.
Is that something to worry about.
BTW I am reading the parameters from software that came with the
motherboard PC Alert(which is suppose to control the fans rpm based a
temp)---a MSI motherboard.
Your input is greatly appreciated.

Re: New cpu fan lower rpm

Does your mb have core cell? if so, pcalert isnt correct software, you need
"core center".
pcalert 4 did nothing for me on a previous MSI board to control fan speed, i
dont believe it does that, it just monitors.
If your board does not have core cell, there still may be a means to control
it manually with
"motherboard monitor" or auto option with "speed fan" (google search)
 my previous msi was controllable without the core cell chip
speed fan is nice to get a rheostatic kind of result, speeds up with higher
temperature in "blunt" stages
 that you setup on your own.
 if  2500rpm  is max and still too hot, you need old fan!
Good Luck.

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Re: New cpu fan lower rpm

Is 145F too hot?

Re: New cpu fan lower rpm


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Check the temps in the bios to confirm PC Alert.

145F is about 63C (we generally use celcuis for temps),
which if it were the absolute max temp it ever reached,
might not be a problem at stock speed.

HOWEVER, the typical temp is not the one to be concerned
about- the cooling solution must be adequate at an extended
full-load condition.  It's fairly easy for temp to go up
several degrees (though less on your CPU than some which
have HALT-IDLE working, I presume yours is an Athlon XP
which typically does not because the motherboard has it
disabled, probably permanenly so through chipset register

To get the max temp, run Prime95's Torture Test, large
in-place FFTs setting.  Leave it running for at least half
an hour (though longer is far better) as it will not only
elevate the temp but also it checks the work on it's
calculations so you can see if the temp induces errors-
something that most other tests do not reveal.

I'm inclinded to think you will need a different fan.  2500
RPM happens to be a good RPM range to be in, as it's
quieter, but apparently either your chassis cooling is poor
or the heatsink itself is inadequate, or the fan is too
thin.  If it is the latter, a thin (like 10 or 15mm thick)
fan, choose a 25mm thick fan and you may need little to no
higher RPM replacement fan, perhaps 3000 RPM just to be on
the safe side (though wait for the Prime95 results to find
out just how hot it's really getting first).  

With a 25mm thick fan you should not need 4500 RPM, and with
a decent quality name-brand fan at the lower RPM it can also
be expected to last a lot longer.  I was about to overlook
very small diameter fans- if it's only 60mm wide, you may
still need higher RPM with a 25mm thick fan.  Personally, i
would just replace the whole heatsink if it can only accept
60mm dia. fans, as even though there are fan adapters they
are of limited usefulness as they cause a larger volume of
air to need pressurized and the 'sink body itself is still
small.  Far better to use a 'sink that takes an 80x25mm fan.

You failed to mention the specific CPU and heatsink so these
are only generalities.

Re: New cpu fan lower rpm

Good information Kony.
Thanks for your help on this.

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