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:
http://members.shaw.ca/haruspex/P3/P3_Heatsink.html
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?
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.
