On May 27, 2010, at 11:44 PM, Kris Tilford wrote:
And you quote below it is to be 128MB where yours in hand is 256???
This is a mistake by Apple, when the Lombard came out 128MB was the
largest SoDimm manufactured. It can take 256MB fine.
Almost true.
When the Lombard was tested in-house, Apple only qualified 128 MB
sticks, and it did not qualify any 256 MB sticks because these were,
then, too expensive, therefore Apple's specification reads that only
sticks up to and including 128 MB sticks are approved (and are
guaranteed to work). The design limit of the Wallstreet and Lombard
DRAM controller is 2 x 256 MB = 512 MB, with no stick exceeding 256
MB. 512 MB sticks were finally supported in the Pismo.
The same thing happened on the Beige G3, where 384 MB, maximum,
remained in the specification long after everyone and his uncle had
abandoned 128 MB stick production for 256 MB stick production. The
Beige G3 (all models) has an actual maximum of 768 MB, although for
the DT Beige G3, only "low profile" sticks will fit, unless the PSU's
fan protector is removed from the upper half of the "clamshell" case.
In all cases, only "low density" RAM is supported, as is usual for
Apple. The design limit of the Beige G3 DRAM controller is 3 x 256 MB
= 768 MB, with no stick exceeding 256 MB. 512 MB sticks were finally
supported in the Gigabit Ethernet G4.
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