CHAPTER 4
RAM Expansion
Main RAM Expansion 51
Configuration of RAM SO-DIMMs 4
Table 4-1 shows the sizes of the RAM expansion modules that can be used in
the iMac computer and the different sizes of SDRAM devices that make up
those modules.
The iMac accepts either one or two SO-DIMMs. Any of the supported
SO-DIMM sizes can be installed in either slot, subject to the limits on the
dimensions of the SO-DIMMS. The memory controller configures the combined
memory of the SO-DIMMs into a contiguous array of memory addresses.
Note
The iMac does not support memory interleaving, so
installing two SO-DIMMs of the same size does not result
in any performance gain.
Table 4-1 Sizes of RAM expansion modules and devices
Device size
Device
configuration
Number of
devices
per bank
Size of
each bank
16 Mbits 2M x 4 x 2 16 32 MB
16 Mbits 1M x 8 x 2 8 16 MB
16 Mbits 512K x 16 x 2 4 8 MB
64 Mbits 8M x 4 x 2 16 128 MB
64 Mbits 4M x 4 x 4 16 128 MB
64 Mbits 4M x 8 x 2 8 64 MB
64 Mbits 2M x 8 x 4 8 64 MB
64 Mbits 2M x 16 x 2 4 32 MB
64 Mbits 1M x 16 x 4 4 32 MB
64 Mbits 1M x 32 x 2 2 16 MB
64 Mbits 512K x 32 x 4 2 16 MB
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