Does a Pentium 3 800MHz need a fan?

....or is passive cooling enough. I want to reuse my old motherboard for
something else, but it can't make a lot of noise...

It puts out a LOT of heat. If you don't want to fry it, get a fan.

--
DaveW



<Nittaku> wrote in message
news:3fa990c7$0$30716$ .be...
> ...or is passive cooling enough. I want to reuse my old motherboard for
> something else, but it can't make a lot of noise...
>
>

<Nittaku> wrote:

> ...or is passive cooling enough. I want to reuse my old motherboard for
> something else, but it can't make a lot of noise...


=MAYBE= if you unclock/undervolt it a bunch?
--

Stacey

On Thu, 6 Nov 2003 01:09:37 +0100, <Nittaku> wrote:

>...or is passive cooling enough. I want to reuse my old motherboard for
>something else, but it can't make a lot of noise...
>

As Stacey mentioned, you might consider underclocking, undervolting
it. Running on a 66MHz FSB, 533MHz CPU speed, it might run stable at
around 1.4-1.5V, wouldn't need a fan on the heatsink then though you'd
still need normal case airflow, assuming the typical motherboard with
socket more-or-less right under the power supply air intake (that is,
you should use a power supply with this air intake on the underside.

You don't really need to go to that much trouble though, a P3 800 is
not very hot running, relatively speaking. Intel's datasheets would
give a max wattage but it's in the ballpark of 22W of heat under a
fairly high load situation, but a lot lower if mostly sitting idle on
a motherboard and OS that's ACPI supportive. All but the smallest or
cheapest of heatsinks should be OK with a low-RPM, quiet fan on them.

You might just be able to take the easy way out, get a power supply
fan adapter and run the current fan at 5-7V.


Dave

kony wrote:

>
> You don't really need to go to that much trouble though, a P3 800 is
> not very hot running, relatively speaking. Intel's datasheets would
> give a max wattage but it's in the ballpark of 22W of heat under a
> fairly high load situation, but a lot lower if mostly sitting idle on
> a motherboard and OS that's ACPI supportive. All but the smallest or
> cheapest of heatsinks should be OK with a low-RPM, quiet fan on them.
>
>


It's been a while since I looked at one of those but would a HS off an
athlon fit? If so a HS off a later model AMD with a power supply that blows
across the CPU (some have the fan on the inside that does this) would
probably be plenty even at 800Mhz.

--

Stacey

<Nittaku> wrote in message
news:3fa990c7$0$30716$ .be...
> ...or is passive cooling enough. I want to reuse my old motherboard for
> something else, but it can't make a lot of noise...
>
>
it definately needs a fan

what i sometimes do is get rid of the hi-rpm and noisy cpu fan
then mount a case fan in such a way as to blow down directly on the cpu
heat sink

the larger fan spins at a lower rpm so is quieter
and due to it;s size...actually cools better!

philo wrote:
> <Nittaku> wrote in message
> news:3fa990c7$0$30716$ .be...
>> ...or is passive cooling enough. I want to reuse my old motherboard
>> for something else, but it can't make a lot of noise...
>>
>>
> it definately needs a fan
>
> what i sometimes do is get rid of the hi-rpm and noisy cpu fan
> then mount a case fan in such a way as to blow down directly on the
> cpu heat sink
>
> the larger fan spins at a lower rpm so is quieter
> and due to it;s size...actually cools better!

....and you can duct it with a home-made duct and even a home-made shroud,
maybe pull/push the air through the fins laterally (works really well).
Cardboard is fine for this. I'm thinking of doing it on my Athlon XP.
--
~misfit~