Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Computing > Computer Support > Bizarre CPU fan issues

Reply
Thread Tools

Bizarre CPU fan issues

 
 
Jase
Guest
Posts: n/a
 
      02-04-2004
Hi,

I've been having problems with my AMD Athlon XP 2000+ CPU overheating
recently so I bought a Akasa King Copper 824CU today.

I fitted the new fan and switched the machine on but before it tested the
memory the machine stopped and displayed "CPU Fan error" (or something like
it) across the middle of the screen then powered itself down. This happened
before I could access the BIOS.

I had no idea what the problem was as I connected the new cable to the same
power connector as the old fan (on the mobo). I then tried connecting the
old fan (lying loose in the system) into the mobo connector and new fan
(still on the CPU) onto a spare power connector - and it worked! This then
allowed me to get into the BIOS and I disabled "Detect CPU Fan Post" - I've
no idea what it does but I can now connect the new fan into the mobo power
supply and it works fine - so far it appears to cool the CPU by over 20 deg
C!

However the fact it detected a problem with this BIOS setting enabled
worried me. Does anyone know what the issue is and how to resolve it?

One other question... my old fan *seemed* to blow air out but the new fan
seems to suck air in - what is the correct way?


 
Reply With Quote
 
 
 
 
philo
Guest
Posts: n/a
 
      02-04-2004

"Jase" <(E-Mail Removed)> wrote in message
news:bvriot$1010s2$(E-Mail Removed)-berlin.de...
> Hi,
>
> I've been having problems with my AMD Athlon XP 2000+ CPU overheating
> recently so I bought a Akasa King Copper 824CU today.
>
> I fitted the new fan and switched the machine on but before it tested the
> memory the machine stopped and displayed "CPU Fan error" (or something

like
> it) across the middle of the screen then powered itself down. This

happened
> before I could access the BIOS.
>
> I had no idea what the problem was as I connected the new cable to the

same
> power connector as the old fan (on the mobo). I then tried connecting the
> old fan (lying loose in the system) into the mobo connector and new fan
> (still on the CPU) onto a spare power connector - and it worked! This

then
> allowed me to get into the BIOS and I disabled "Detect CPU Fan Post" -

I've
> no idea what it does but I can now connect the new fan into the mobo power
> supply and it works fine - so far it appears to cool the CPU by over 20

deg
> C!
>
> However the fact it detected a problem with this BIOS setting enabled
> worried me. Does anyone know what the issue is and how to resolve it?
>
> One other question... my old fan *seemed* to blow air out but the new fan
> seems to suck air in - what is the correct way?
>
>



looks like your bios is looking for a certain RPM
and the new, larger fan with it's lower RPM looks like an error

that happend to me onone machine and i had to update the bios
in order not to get the low RPM error

fans generally blow in....towards the cpu


 
Reply With Quote
 
 
 
 
Jase
Guest
Posts: n/a
 
      02-04-2004
"philo" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>
> looks like your bios is looking for a certain RPM
> and the new, larger fan with it's lower RPM looks like an error
>
> that happend to me onone machine and i had to update the bios
> in order not to get the low RPM error


Ahhhhh.... that makes sense.

Why/how do new fans have a lower RPM but maintain such good cooling?


 
Reply With Quote
 
Kráftéé
Guest
Posts: n/a
 
      02-04-2004
Jase wrote:
> "philo" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>>
>> looks like your bios is looking for a certain RPM
>> and the new, larger fan with it's lower RPM looks like an error
>>
>> that happend to me onone machine and i had to update the bios
>> in order not to get the low RPM error

>
> Ahhhhh.... that makes sense.
>
> Why/how do new fans have a lower RPM but maintain such good cooling?


Better effeciency


 
Reply With Quote
 
ICee
Guest
Posts: n/a
 
      02-04-2004
Kráftéé wrote:
> Jase wrote:
>> "philo" <(E-Mail Removed)> wrote in message
>> news:(E-Mail Removed)...
>>>
>>> looks like your bios is looking for a certain RPM
>>> and the new, larger fan with it's lower RPM looks like an error
>>>
>>> that happend to me onone machine and i had to update the bios
>>> in order not to get the low RPM error

>>
>> Ahhhhh.... that makes sense.
>>
>> Why/how do new fans have a lower RPM but maintain such good cooling?

>
> Better effeciency


It could also be that the tach signal from the new fan is 'dirty' and
not being read properly in the BIOS. Also, some fans draw more current
than the header on the MB can supply, which will cause problems. In
these cases, it's best to just connect the CPU fan directly to the PSU,
as you have done.
Just set the temp alarm in the BIOS and/or run a monitoring program to
look at the temps and/or voltages, and there won't be any problem if the
fan should fail and the CPU overheats. A good one is MotherBoard
Monitor:
http://mbm.livewiredev.com/


 
Reply With Quote
 
philo
Guest
Posts: n/a
 
      02-04-2004

"Jase" <(E-Mail Removed)> wrote in message
news:bvrjen$102fdd$(E-Mail Removed)-berlin.de...
> "philo" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> >
> > looks like your bios is looking for a certain RPM
> > and the new, larger fan with it's lower RPM looks like an error
> >
> > that happend to me onone machine and i had to update the bios
> > in order not to get the low RPM error

>
> Ahhhhh.... that makes sense.
>
> Why/how do new fans have a lower RPM but maintain such good cooling?
>
>


The one I used was physically larger than the old one...
so "pushed" more air but at a lower RPM


 
Reply With Quote
 
Blinky the Shark
Guest
Posts: n/a
 
      02-04-2004
Jase wrote:

> I had no idea what the problem was as I connected the new cable to the same
> power connector as the old fan (on the mobo). I then tried connecting the
> old fan (lying loose in the system) into the mobo connector and new fan
> (still on the CPU) onto a spare power connector - and it worked! This then
> allowed me to get into the BIOS and I disabled "Detect CPU Fan Post" - I've
> no idea what it does but I can now connect the new fan into the mobo power
> supply and it works fine - so far it appears to cool the CPU by over 20 deg
> C!


Kopper is King.

The old HS was probably a cheezy OEM aluminum job, right?

> One other question... my old fan *seemed* to blow air out but the new fan
> seems to suck air in - what is the correct way?


That's a holy wars issue. My answer: whichever way the HSF manufacturer
supplied it.

--
Blinky Linux RU 4892F
Stolen SCO Code: http://snipurl.com/stolen
 
Reply With Quote
 
Graeme
Guest
Posts: n/a
 
      02-05-2004
"philo" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>
> "Jase" <(E-Mail Removed)> wrote in message
> news:bvrjen$102fdd$(E-Mail Removed)-berlin.de...
> > "philo" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > >
> > > looks like your bios is looking for a certain RPM
> > > and the new, larger fan with it's lower RPM looks like an error
> > >
> > > that happend to me onone machine and i had to update the bios
> > > in order not to get the low RPM error

> >
> > Ahhhhh.... that makes sense.
> >
> > Why/how do new fans have a lower RPM but maintain such good cooling?
> >
> >

>
> The one I used was physically larger than the old one...
> so "pushed" more air but at a lower RPM
>


Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
3300rpm (when the PC is more or less idle). At this speed it is quite noisy.
Is it possible to replace these? If so, any suggestions.
TIA


 
Reply With Quote
 
Bill Purvis
Guest
Posts: n/a
 
      02-05-2004
Have a look here

http://www.quietpc.com/

"Graeme" <(E-Mail Removed)> wrote in message
news:bvtt6o$10uhm9$(E-Mail Removed)-berlin.de...
> "philo" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> >
> > "Jase" <(E-Mail Removed)> wrote in message
> > news:bvrjen$102fdd$(E-Mail Removed)-berlin.de...
> > > "philo" <(E-Mail Removed)> wrote in message
> > > news:(E-Mail Removed)...
> > > >
> > > > looks like your bios is looking for a certain RPM
> > > > and the new, larger fan with it's lower RPM looks like an error
> > > >
> > > > that happend to me onone machine and i had to update the bios
> > > > in order not to get the low RPM error
> > >
> > > Ahhhhh.... that makes sense.
> > >
> > > Why/how do new fans have a lower RPM but maintain such good

cooling?
> > >
> > >

> >
> > The one I used was physically larger than the old one...
> > so "pushed" more air but at a lower RPM
> >

>
> Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
> 3300rpm (when the PC is more or less idle). At this speed it is quite

noisy.
> Is it possible to replace these? If so, any suggestions.
> TIA
>
>



 
Reply With Quote
 
kony
Guest
Posts: n/a
 
      02-05-2004
On Thu, 5 Feb 2004 17:05:55 -0000, "Graeme" <(E-Mail Removed)>
wrote:


>Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
>3300rpm (when the PC is more or less idle). At this speed it is quite noisy.
>Is it possible to replace these? If so, any suggestions.
>TIA
>


Due to the design, incorporating the fan into a plastic shroud, it's
harder than it "could" be. You might put a resistor or series of
didoes, in series on the power leads, or take off the shroud,
carefully cuttin out the fan and leaving a flat hole where you could
attach the fan of your choice.

Alternatively you could just drill holes in the fins and attach the
fan with 4 L-brackets and screw/bolts, or just buy a new 'sink. It's
a shame that after all this time, intel still uses such a proprietary
'sink... I guess they think it looks cool.
 
Reply With Quote
 
 
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Thermaltake ISGC Fan 12 120MM Fan Ian Front Page News 0 06-22-2009 01:28 PM
no boot - cpu fan starts then stops - mboard led on - no power supply fan danpearson@doubt.com Computer Support 3 12-30-2006 05:46 PM
Bizarre 7960 SIP phone intermittent connectivity issues Grafton Corruption Cisco 1 09-27-2004 07:40 PM
Laptop CPU fan does not spin while in XP Jack B. Pollack Computer Support 11 01-07-2004 04:14 PM



Advertisments