PIII - does this heatsink need a fan?

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Hi group!

I want to replace the PII-350mHz on my ASUS P2B board with this PIII-550mHz
CPU from eBay.  Have a look at it here:


It has a Compaq sticker on it, no scratches on the contacts, so probably
new old-stock.

This heatsink has no fan, nor does it look like a fan would mount on it.  
Lots of aluminum, though.

Question: Is this designed to run without a fan?  Anyone into Compaq lore?


- Ralph

Re: PIII - does this heatsink need a fan?

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I can't actually answer your question directly, but my PII 333MHz used to
have a fan, so I guess this 550 one should as well with the stock heatsink,
but that is a big heatsink for a PII, so perhaps not. I would suggest trying
it and see what the temperatures are - get some free temperature monitoring
software and google for PII operating temperatures. If it runs a too hot,
then you can always run with the side off the case and point a desk fan at
it, while you get some kind of bracket+fan attachment setup to point at it

Re: PIII - does this heatsink need a fan?

On Thu, 15 Nov 2007 14:03:41 GMT, Ralph Innes

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It cannot run without a fan unless a specially designed duct
is used to channel the airflow (exhausted by PSU usually at
that point in time though perhaps they had already switched
to the more modern method of exhaust out a rear case fan)
though it.  By "specially designed" I don't necessarily mean
you need the one Compaq used, but one you design to work
with your case and fan locations.  Making such a duct isn't
terribly hard but takes more materials and longer than
putting a fan on the 'sink instead.

By modern standards they aren't very hot running but
certainly hot enough to need more than that heatsink if
installed into a system without ducting.

Easier than the duct would be to find a way to strap the fan
on.  One way appears to be slipping a couple of nylon wire
ties through the heatsink channels between it and the CPU to
strap down the fan... using multiple nylon ties linked
together if they aren't long enough.  

Another way would be to take your desired fan, perhaps a
60mm diameter would fit but I'm unsure, maybe only 50mm,
holding it on the heatsink to note what spaces between the
'sink tines correspond to the mounting holes in the fan
frame and marking those fin positions.  Next take some
threaded brass inserts matching the intended screw, or some
hunks of plastic (maybe the smaller end of a plastic ink
pen) and place them in the right positions in the 'sink
tines and liberally apply epoxy around them (but not in
their screw hole) to secure them.

Another option would be to drill a couple holes through the
'sink corresponding to the two fan frame holes on one end,
on the portion of the 'sink that extends up higher than the
processor.  Two tight nuts and bolts should hold the fan on
sufficiently, though if it vibrates you might need a bumper
on the bottom or some washers as spacers to get the bottom
half of the way a short distance away from the heatsink.

Another option would be pulling the back of the CPU casing
off, popping off the clips than hold the heatsink on and
installing your own.  Similar to the fan mount methods,
there are other ways to mount it.  I have in the past taken
a plain old, roughly 60mm square heatsink meant for a socket
370 processor and just strapped it onto a slot 1 Celeron
using nylon wire ties (and of course heatsink grease
inbetween them).  You could instead drill out holes in the
heatsink tapped to accept a small bolt or threaded from a
metal screw inserted through the CPU PCB holes, but IIRC
those holes are fairly small.

Re: PIII - does this heatsink need a fan?

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If your new PIII was from a Compaq, There was a shroud covering the CPU that
directed the air flow out the fan on the back of the case.
I have seen those same chips used without the shroud, but with good airflow
through the case.

Re: PIII - does this heatsink need a fan?

RIAA wrote:
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Actually, in this case the CPU was at the front of the motherboard, lying
down in it's slot as opposed to sitting perpendicular to the board and there
was a fan at the front of the case (unshrouded) blowing over the heatsink.
To fit that CPU into a normal, perpendicular Slot 1 you'll have to take a
hacksaw or Dremel to the sides of the (Foxcon) heatsink as it won't fit,
it's too wide.

However, there's nothing stopping you doing that. Or swapping the heatsink,
it's clipped on. I've done the same thing using a Compaq Slot 1 CPU. In fact
I even have what's left of the heatsink in my drawer. I've cut bits off it
over the years to make RAM and MOSFET sinks.


Re: PIII - does this heatsink need a fan?

On Sat, 17 Nov 2007 00:35:27 +1300, "~misfit~"

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Good eye, I completely overlooked how wide the 'sink was...
leave it to Compaq to do things the hard way.

Re: PIII - does this heatsink need a fan?

Somewhere on teh interweb kony typed:
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Yeah. As I mentioned, this beast of a CPU/HS was mounted horizontally, it
slid into a completely different mounting arrangement to other Slot 1 CPUs.

Still, it was a good source of finned aluminium for making small 'sinks. :-)
I probably still have some of it....

LOL, sure enough. I even have the bit that has the model of the HS on it;
Foxconn 400342-002 E.


Re: PIII - does this heatsink need a fan?

On Sat, 17 Nov 2007 18:03:16 +1300, "~misfit~"

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Same here.

A majority of the larger heatsinks I got for free and cut
into smaller pieces did come from Compaq processors.

I have so many heatsink pieces that at this point, anything
other than reusing what I have seems a terrible waste.  The
primary problem is I'm too lazy to put my arctic silver
epoxy into a freezer so it only has about 1 year shelf life
after 1st used.

Re: PIII - does this heatsink need a fan?

Somewhere on teh interweb kony typed:
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That reminds me, mine is had it too, next order I put in must tack some on.
I'm currently waiting on the availablity of a Thermalright bolt-thru kit:


I can't find a stockist in NZ who has it, I have OC NZ waiting on an email
from the NZ Thermalright agent, then they're going to contact me. My
Thermaltake Mini Typhoon (all copper, quite a high cooler in a tower case)
is a bit heavy for those silly little plastic clips, I want to secure it a
bit better. I'll find out about this thing, it's got to be easier than
finding bolts/nuts/washers/springs/sleeves(?) seperately.

Oh, here's the last bit of heatsink making I did, just a few days ago for my
new machine:


(with a little thermal paste on the MOSFETs)

The result:


I'm happy with my new cheap CPU. Running at the same speed as the very
fastest that Intel make for about 20% of the price. Rock-stable of course,
with a heathy temperature margin.


Re: PIII - does this heatsink need a fan?

Ralph Innes wrote:
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Have you read the FAQ for P2B ?
Check the board revision, to see what upgrade options are available.



Re: PIII - does this heatsink need a fan?

Hi group!

Many thanks to ALL who answered my query - a truly helpful array of

"America" (Canada included) used to be a land of innovators.  I've met a
lot of folks, particularly in the U.S., while monkeying around with lenses
and other "stuff."  They're of the same mind-set as I am:  get in there and
poke at it - see what makes it work.  There seems to be a lot of that
"leave servicing to authorized personnel" claptrap around.  Makes you
wonder if California would ever have been settled if folks had sat down
beside their Conestoga, waiting for Triple-A to come fix their broken axle.

Glad to see that there's a dedicated group of knowledgeable tinkerers here.

Again, many thanks.

- Ralph

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Re: PIII - does this heatsink need a fan?

Ralph Innes wrote:  ** and top-posted - fixed **
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... snip ...
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There are tinkerers everywhere.  Some even know what they are
doing.  Which is not a criticism of those who don't.

Please do not top-post.  Your answer belongs after (or intermixed
with) the quoted material to which you reply, after snipping all
irrelevant material.  See the following links:

  <http://cfaj.freeshell.org/google/ (taming google)
  <http://members.fortunecity.com/nnqweb/ (newusers)

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