> Doug Hardman wrote:
> > > According to these sources one can expand the 6100 to 264MB RAM:
> > > <URL:http://www.kan.org/6100/RAM.html>
> > > <URL:http://www.newerram.com/News/Releases/pm6100.htm>
> >
> > If one of those was Apple, I'd agree. I found a site that shows me how to
> > over-clock my G3/233 to 300mhz. If I were to do that, and then cry when
> > software didn't work who's fault would it be?
>
> Overclocking pushes circuit performance on individual signal lines into
> grey areas where state is unstable at the edge of timing related
> transitions resulting in greater noise and unreliability in random or
> patterened failures.
>
> Over RAMming does not create any unstability, as the motherboard
> architecture will have a specific range of RAM it can address 100%
> successfully and a specific range of RAM it cannot address 100% of the
> time. The actual hardware RAM installed will fit into some subset of
> that addressing space consistently with each cycle repeating what it is
> capable of stably. You either can or can't access the full address space
> of the large physical RAM installed into the motherboard, and in the
> case of the 6100 that extends to 256MB in the 2 SIMM sockets as long as
> the two SIMMs are identical, plus you get that 8MB of motherboard RAM.
>
No matter how you explain it, violating the manufacturer's
specifications is a "grey" area! Regardless, adding too much RAM can
cause problems if the access time on the RAM (usually lower on
greater-capacity chips) is incompatible with the motherboard's accepted
rates. I don't believe a 6100 can handle anything below 60 or 70 ns...
Additionally, a friend of mine @ Apple, who worked on the 7100
project, checked into this with some 6100 people. They stated that, due
to "clock and circuit issues," putting more than 72MB of RAM into a 6100
would result in an unstable configuration (at least theoretically).
Sincerely,
Robert Vogt IV
CEO
ArborHost
Computer Engineer, University of Michigan
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