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The computer has two RAM expansion slots that accommodate standard SO (small outline) DIMMs using SDRAM devices. The slot on the underside of the processor card is normally occupied by a factory-installed SO-DIMM. The other slot is available for a user-installed SO-DIMM.
RAM expansion SO-DIMMs for the PowerBook computer must be PC100 compliant and must use SDRAM devices. If the user installs an SO-DIMM that uses EDO devices, the boot process will fail when the user attempts to restart the computer and the computer will not operate.
An SO-DIMM using currently-available parts can contain either 32, 64, 128, 256, or 512 MB of memory. The computer can support up to 1 GB total RAM using the highest-density devices available, but SO-DIMMs made with such devices may draw too much current in sleep mode to allow battery sleep swapping. See RAM SO-DIMM Electrical Limits.