Apple Desktop Computer manual Configuration of RAM SO-DIMMs

C H A P T E R 4

RAM Expansion

Configuration of RAM SO-DIMMs

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.

Table 4-1Sizes of RAM expansion modules and devices

		Number of
	Device	devices	Size of
Device size	configuration	per bank	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

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.

Main RAM Expansion 51