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About memory
You can have memory—dynamic random-access memory (DRAM)—added
to your computer in packages called Single Inline Memory Modules, or
SIMMs. You can also upgrade your computer’s memory by installing a
High Performance Module (256K Level 2 Cache).
DRAM configurations
Your computer can use any DRAM configuration with SIMMs of these sizes:
1, 2, 4, 8, 16, or 32 megabytes (MB). The exact configuration depends on the
density of the DRAM chips that are mounted on the SIMMs. (The SIMMs
support both 2K and 4K refresh rates.)
IMPORTANT
The SIMMs should be 32-bit-wide, 72-pin fast-paged mode, with
70-nanosecond (ns) RAM access time or faster. SIMMs from older Macintosh
computers are not compatible with your computer and should not be used.
If you decide to have additional DRAM installed in your computer, the
SIMMs can be installed one-at-a-time in any order in either of the memory
slots.
Cache configurations
A memory cache provides an overall increase in your computer’s
performance. You can add a cache by installing a High Performance Module
(256K Level 2 Cache) on the main logic board of your computer.
WARNING
Although instructions for installing SIMMs are provided in
this manual, Apple Computer strongly recommends that you have an
Apple-certified technician install additional DRAM or cache. Consult
the service and support information that came with your computer for
instructions on how to contact an Apple-authorized service provider or
Apple for service. If you install additional SIMMs yourself, you risk
damaging your equipment, and this damage is not covered by the
limited warranty on your computer. See an Apple-authorized dealer or
service provider for additional information about this or any other
warranty question.
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Installing Expansion Cards and Adding Memory