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54 Chapter 4
Installing Memory
You can install additional dynamic random-access memory (DRAM) in packages called Dual
Inline Memory Modules (DIMMs) in your computer’s four DRAM DIMM slots on the main
logic board. You can expand your computer’s DRAM to a maximum of 1536 megabytes (MB).
To check the amounts of DRAM and video memory installed, use the Apple System Profiler
program.
If you install 512 MB DIMMs they must have 256 megabit (Mbit) devices. You can also install
256 MB DIMMs that have 256 Mbit or 128 Mbit devices. You can install different size DRAM
DIMMs in any order in any DIMM slot. To check the compatibility of your 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 2.0 inches.
Important DIMMs from older Macintosh computers are not compatible with your Power
Mac G4. Only “PC-100” DIMMs from recent Power Macintosh G3 and G4 computers and
servers are compatible. Do not use older DIMMs even if they fit into the DRAM DIMM slots.