Jason Thorpe wrote:
> 
> On Fri, 25 Apr 1997 12:48:33 +0930
>  mike smith <miff@spam.frisbee.net.au> wrote:
> 
>  > I'm doing all my building and testing using a single 425t.  One
>  > thing that's worth the effort; go out and buy a 66MHz crystal
>  > oscillator and replace the 50MHz unit next to the CPU (check
>  > that yours is socketed first, perhaps).  The extra performance
>  > makes a handy difference for longer tasks.
> 
> _BE CAREFUL_ if you do this... I had a 425 that Really Lost at 33MHz,
> and had to drop it back down to 25.  At the very least, but a fansink
> on that CPU...

Hmm, I should have mentioned that.  The 425 I have, as well as
the Apollo 5500's all have (small) heatsinks.  I put a Pentium
heatsink on mine and hung a 50mm fan to blow directly on it.

Naturally, you should run the system with the top off and 
monitor the heatsink temperature for several hours as a part
of the process.  Apologies for skimping on the details 8(

I have several times wondered whether it would be feasible to
get a significantly faster '040 and wind the clock much faster.
It's not clear how much of the system is actually run off the
'040's clock; I would guess that eventually you'd run into
timing problems with memory (? is it clocked seperately), or
with the interface between the CPU and the chipset...

--
Mike Smith  *BSD hack  Unix hardware collector
The question "why are the fundamental laws of nature mathematical"
invites the trivial response "because we define as fundamental those
laws which are mathematical".  Paul Davies, _The_Mind_of_God_