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PATH Hardware Documentation
> PowerBook G3 Series 1999
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The RAM expansion modules used in the PowerBook G3 Series computer are standard 144-pin 8-byte DRAM SO-DIMMs, as defined in the JEDEC specifications.
The mechanical characteristics of the RAM expansion SO-DIMM are given in the JEDEC specification for the 144-pin 8-byte DRAM SO-DIMM. The specification number is JEDEC MO-190; it is available from the Electronics Industry Association's web site, at
http://www.eia.org/jedec/download/freestd/pub95/#MO
The specification defines SO-DIMMs with nominal heights of 1.0, 1.25, 1.5, or 2.0 inches. The PowerBook G3 Series computer can accommodate two SO-DIMMS, one with a height up to 1.5 inches and the other with a height up to 2.0 inches.
IMPORTANT
The JEDEC specifications for the heights of the SO-DIMMs gives a plus-or-minus 0.15 mm tolerance. In the PowerBook G3 Series computer, the specified heights for the SO-DIMMs are maximum heights.
The JEDEC specification defines the maximum depth or thickness of an SO-DIMM as 3.8 mm. That specification is also a maximum: Modules that exceed the specified thickness can cause reliability problems.
