Archived from groups: alt.comp.hardware.overclocking (
More info?)
Generally, the faster the fan rotation, the higher the noise level.
Larger diameter, slower fans are quieter (all else being equal.)
Ball bearing fans are noiser than sleeve bearing fans (all else being
equal.)
Isolating the fan frame from the case helps (rubber grommets between the fan
frame, fastners, and case.) Some fan mounting kits have rubber inserts as
fastners.
If you have more than one mounting hole in your case add a fan. Sound
levels are specified in dB, a logrithmic scale, where two 30 dB fans
combined would sound twice as loud, and measuare a 33 dB sound level. (A
sound level of 30 dB is about that measured in a Library. See
http://home.new.rr.com/trumpetb/audio/dBexamp.html for a chart of
comparative sound levels.)
What you need is more air flow; if you don't have any additional fan holes,
then there are at least seven choices.
a. cool the air entering the system case
b. cut an additional hole and add a fan
c. add an internal fan that improves air circulation within the case (may
not help enough
d. use an adapter to replace the current fan with a larger diameter fan
e. add an additional fan in series with the original fan.
f. move to more exotic heat transfer methods, such as water circulation or
a heat pipe.
g. do nothing
So far you don't seem to have noticed any problems other than readings. For
the moment, (g.) has the advantage of being easy, free, and no louder.
--
Phil Weldon, pweldonatmindjumpdotcom
For communication,
replace "at" with the 'at sign'
replace "mindjump" with "mindspring."
replace "dot" with "."
"Kevin Lam" <sorchu_bf@hotmail.com> wrote in message
news:e9df0da0.0503011252.1dc630b@posting.google.com...
> Thanx very much for all of your help
>
> Just a little more info for my problem, the ambient temp (room temp?)
> is about 23~25C, I turned off my heating tonight and the room temp is
> about 18C
> and the case temp if i turn on the computer and do nothing, is about
> 38~39 and the cpu is about 50C
>
> After 30 mins with rainbow 6, it has gone up to 43C and 57C
> I am writing this message with case temp 41C and cpu 53C
>
> I think the room temp is affecting the sys quite a lot, has anyone got
> any suggestions about a high rpm and low noise fan? preferably not too
> expensive...
>
> For the voltage problem, I think that it's probably caused by the
> board's temp... the monitoring program doesn't complain anymore as I
> change the fans direction back to how it was, which increased cpu temp
> by 3C but lowered the case temp by 8C...
>
> The voltage is constantly at 3.13... I still think it's quite low, but
> dunno what to do...
>
> Thx
>
> Kev
>
> "Phil Weldon" <notdisclosed@example.com> wrote in message
news:<kYMUd.10452$Ba3.9224@newsread2.news.atl.earthlink.net>...
> > Intel Pentium 4 CPU motherboards use the + 12 volt rail for CPU power.
I
> > believe most AMD CPU motherboards use the 3.3 volt rail.
> >
> > The +12 volt rail for Intel Pentium 4 motherboards is connected by a
> > seperate 4-pin, square molex connector from the power supply to the
> > motherboard (near the DC to DC downconvertor/regulator). Intel Pentium
4
> > and Athlon CPU's use about the same core voltage (~ 1.5 volts). Intel
> > changed to the 12 volt rail because of the high power demands faster
CPU's
> > with huge numbers of transistor. A CPU drawing 90 Watts of power needs
a
> > current of 60 amperes at 1.5 volts. If the DC-DC conversion is supplied
> > from the 3.3 volt rail, that requires 90 watts/3.3 volts = ~27 amperes
PLUS
> > another 30% or so for loses in the conversion. That requires very big
> > traces on the motherboard, and also means relatively higer losses from
> > resistance, and consequently higher heat production. The same 90 Watts
at
> > 12 volts requires only 7.5 Amperes plus another 30% or so.
> >
> > Newer ATX power supplies should be specified for load sharing; the +12
> > volt, + 5 volt, and + 3.3 volt rails share the combined wattage for
those
> > three rails, with up to nearly the full remaing power outpout available
to
> > any of these rails (there is no specific limit for each of the three
rails.)
> >
> > Almost everything powered from the 3.3 volt rail is further regulated
and/or
> > DC to DC downconverted before being used: the CPU in your case, the
> > chipset, the graphics card (unless it too has a 12 volt connection.
> >
> > Again, you do have a severe heat problem, and that may also be causing
your
> > 3.3 volt sag.
> >
> > Additional information that would help in diagnosis would be the ambient
> > room temperature, the number and size of fans, and the direction of air
flow
> > through the fans, the type of heatsink, etc. Either range of CPU
> > temperature you mention is ok, but your motherboard temperature is
> > definately TOO HIGH.
> >
> > As other people have mention, use other monitoring software to check the
3.3
> > volt rail, maybe even checking the voltage with a digital multimeter
before
> > considering replacing the power supply. At any rate, the HIGH
motherboard
> > temperature is a more pressing problem than the apparent 3.3 volt sag.
And
> > yes, ~ 3.10 to 3.13 is still a bit low. HOWEVER, the voltage sensing
> > devices, the Analog to Digital hardware, and the monitoring software
> > combination probably mean that there is no real difference between a
reading
> > of 3.10 and 3.13 volts (less than 1%). Again, what is the 3.3 volt rail
> > reading right after boot up? What is the motherboard temperature at
idle?
> > CPU temperature at idle?
> >
> >
> > Fix your heat problem and perhaps the apparent voltage will go away.
> >
> >
> >
> > --
> > Phil Weldon, pweldonatmindjumpdotcom
> > For communication,
> > replace "at" with the 'at sign'
> > replace "mindjump" with "mindspring."
> > replace "dot" with "."
> >
> > "Kevin Lam" <sorchu_bf@hotmail.com> wrote in message
> > news:e9df0da0.0502281213.1f25ad28@posting.google.com...
> > > Thank you very much phil, that's a very detail answer, My system
> > > details are listed as requested:
> > >
> > > Athlon 3000+
> > > 1G 3200 DDR
> > > 250W power supply
> > > Maxtor Diamond plus 9 7200rpm
> > > 16X DVD rw
> > > MSI MEGA 180 case
> > >
> > > I think to answer your question about why the case is so hot, it's
> > > because it's a SFF barebone, and I altered the system fan as suggested
> > > by other peoplpe who are using it, it decreases the cpu temp from 56C
> > > to 52C but increased the case temp from 43C to 51C, which after some
> > > thoughts, i think it's not worth it, because the cpu can probably
> > > torlerate a higher temp than, say the motherboard and harddisk...
> > > correct me if i am wrong.
> > >
> > > My worry is really that, what's the use of the 3.3V lead? I mean, if
> > > it's low because the cpu is drawing power from the 5V lead which it
> > > shares with, and the 3.3V lead is not used, then,I guess it doesn't
> > > matter, but could you tell me what's the use of it?
> > >
> > > I changed the fan back to how it's originally set and with 43C case
> > > temp and 56C cpu temp, the 3.3v lead seems to provide 3.10 ~ 3.13v ,
> > > would that be ok?
> > >
> > > I mean my ultimate question is, would my system runs into trouble with
> > > the dropped voltage?
> > >
> > > Thx
> > >
> > > Kevin
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