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64 Chapter 4
Installing Memory
You can install additional dynamic random-access memory (DRAM) in packages called Dual
Inline Memory Modules (DIMMs).
Your computer’s DRAM can be expanded to a maximum of 1536 megabytes (MB) by
installing DIMMs in the three DRAM DIMM slots on the main logic board.
If you use 512 MB DIMMs, they must have 256 megabit (Mbit) devices. You can use 256 MB
DIMMs that have 256 Mbit or 128 Mbit devices. To check the compatibility of these DIMMs,
see the Apple Macintosh Products Guide on Apple’s Web site: www.apple.com/guide
DIMMs must fit these specifications:
m “PC-100” Synchronous DRAM (SDRAM)
m 3.3 volt (V)
m 64-bit wide, 168-pin module
m Maximum number of memory devices on a DIMM is 16.
m Unbuffered; do not use registered or buffered SDRAM.
m Height must not exceed 1.38 inches (35 millimeters).
Video memory for standard Macintosh models is supplied by Synchronous DRAM (SDRAM)
soldered onto the AGP 2X graphics card that supplies the computer’s monitor port. Standard
Macintosh models come with 16 megabytes (MB) of SDRAM video memory.
You can use the Apple System Profiler program installed on your computer to check the
amounts of DRAM and video memory installed.
Important This computer uses SDRAM DIMMs. Only “PC-100” DIMMs from recent Power
Macintosh G3 and G4 computers and servers are compatible with the ones your computer
uses; DIMMs used in other older Macintosh computers are not. Do not use older DIMMs
even if they fit into the DRAM DIMM slots.