Hi all,

Just my experience on 3/60 cooling :

I have made a "silent" 3/60. I stripped the
pizzabox by removing the metal sheet that
holds the motherboard rails and the backpane
(just some rivets to remove), so I can put
the motherboard to the "free air", thus
allowing natural convection. Note that the
motherboard is "belly up", because the
metal sheet covers only the component side.
A photo is available at :
http://pricorde.free.fr/museum/troll.html

For the PSU, natural convection is generally
very risky, and for the 3/60 PSU, in my opinion,
this is impossible without a complete reshape
of the PSU box. (off course, a PSU must be always
closed to avoid electric shocks!)

So I used an old trick: I used an IBM-PC PSU with
a very quiet underpowered fan (at 7V (12-5)).

Finally, the 3/60 is very stable, and barely
audible. I use it regularly for long periods of time,
with high load, and I never had any overheating problems.
Note also that it has also 24 1Mb SIMMs...

Maybe the lack of RF shielding is bad, but at 20Mhz...

About frequency... I also tried to overclock it at 24Mhz,
in the "silent" configuration! It was a success...during
the winter. As soon as the temperature raises, I have
SCSI failures. So I sticked to 20Mhz and everything runs fine.

Pierre-Michel