Table 4-6 shows information about the different sizes of SDRAM devices used in the memory modules. The device configuration column shows three numbers that characterize each type of device: the number of addresses, the number of data bits per access, and the number of internal banks. The fourth column in the table shows the size of each bank of devices, which is based on the number of internal banks in each device and the number of devices needed to make up the 8-byte width of the data bus. The last column shows the memory size of the largest SO-DIMM with that device size that the PowerBook G3 computer will accommodate.
Table 4-6 Sizes of RAM expansion devices and modulesThe computer accepts either one or two SO-DIMMs. The bottom slot can accommodate a 1.5-inch SO-DIMM with up to 128 MB of SDRAM. The top slot can accommodate a 2.0-inch SO-DIMM with up to 256 MB of SDRAM. The memory controller configures the combined memory of the SO-DIMMs into a contiguous array of memory addresses.
Note
The PowerBook G3 Series computer does not support memory interleaving, so installing two SO-DIMMs of the same size does not result in any performance gain.