--- Jeff Walther <[EMAIL PROTECTED]> wrote:
> Right down to the surface mount cap and resistor
> placement, the
> boards are identical except for the DRAM video
> connectors.
I don't want to spend much money on it, but I can pick
up an 8100 board for about �10. I would like to keep
it around just as an OS9 machine for running older
software so I can just use my newer mac for OSX (and
thus trash the troublesome OS9 folder).
> Anyway, if you clean up the old heat sink compound
> (which is probably
> more like a powder than a paste at this point) and
> replace it with
> fresh, and properly replace the heat sink, that
> should solve that
> question.
Yes, it was a bit powdery. Replacing it might solve
the problem, but given I've never had heat problems
with this before, I'm not holding my breath.
> Oh, one other test--turn on the machine, with the
> heat sink wires
> plugged in to the motherboard (assuming you do have
> the peltier
> cooler, as you should) but with the heat sink
> hanging loose. The CPU
> side of the heat sink should become noticeably cool.
> Don't run it
> like this for more than 30 seconds or so, since you
> don't want to
> overheat your sinkless CPU.
I did that last night - the peltier got very cool so
it seems to be working OK. I'm not sure about the
8100, but in the Radius, the PSU fan sits right above
the CPU blasting cool air on to it (or sucking hot air
away; I'm not sure which). I really don't think it's a
heat issue.
> ...I imagine that any well
> stocked PC shop in
> your vicinity will sell something similar, though
> perhaps more dearly.
Yeah I got some today.
> Anyway, if the CPU isn't cracked, and if it isn't
> overheating--that
> may yet be the problem--then I am out of ideas.
> You've tried the
> thorough trouble-shooting technique--Unplug
> everything, swap what you
> can on a minimal hardware setup, see if it works.
I'm stumped too. I was hoping that this was maybe a
known problem in the x100 series. I suppose it could
be short on the motherboard, but even then I could
usually detect that. That said, I've generally found
these nubus-based PPCs to be absolutely solid. I wish
this could be said for the 2nd-gen PCI-based machines.
> I will tell you that on the 7100 I have seen several
> machines which
> were overheating because of aged heat sink compound
> which had gone to
> powder.
If I remember right, the 7100 lacked a peltier and the
CPU wasn't exactly well positioned for cooling. The
6100 was even worse, especially if a video card was
installed overhead. I've had heat-problems on that
machine where the PDS video card would start to fry
and screw up the picture. It did have a 7200 RPM HD
and 240MHz G3 card installed within a few inches of
each other, mind you :-)
Elavating the machine by a few inches solved that one.
Overheating is something I would expect on the cramped
6100 or 7100, but not a well-ventilated, spacey Radius
81/110. I should also point out that I was using this
with a Sonnet G3 PDS card, which when enabled,
disables the 601. Although this is a software
extension which only kicks in after startup, up until
which the 601 CPU is running as normal.
It's not clear if the card simply powers down the 601
or isolates it, in which case the old CPU may still be
running instructions and getting hot.
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