On Jan 24, 2010, at 10:21 PM, Dana Collins wrote:
Saying that I have to include that the very same Quicksilver didn't
take an
identical DIMM -- it just ignored it and showed the memory bank as
being empty
-- while the other DIMM was recognized normally. That was PC133 RAM
by the way
and the DIMMs has serial numbers in sequenze. It was and is a
mystory to me.
If you have used PC-100 in a unit designed for faster RAM, I would
say that
is an anomaly, or you have the darned luckiest Mac on the
planet! :-). It is
my understanding, supported by both advice and experience, that units
needing PC-100 are forward compatible (i.e. You can use PC-133 in a
Sawtooth
requiring PC-100), but not the opposite.
Actually towards the end of the widespread use of PC-100 standard, a
lot of "PC-100" DIMMS were shipped that were actually PC-133 parts,
since they could use use marginal chips of a higher speed in a lower
speed item, usually with success, thus salvaging some value form chips
that would ordinarily be thrown out; they may not run reliably at
PC-133 speeds, but they'll often work, somewhat.
When RAM became a commodity item, all sorts of weird things happen at
the margins.
--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group
Institutions do not have opinions, merely customs
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