Apple Setting Up Your Power Macintosh G4 (PCI & AGP) - Manual (Page 27)

Working Inside the Computer 27
DRAM Configurations
Your computer’s DRAM can be expanded to a maximum of 1024 MB by adding DIMMs to the
four DRAM DIMM slots on the main logic board.
DIMMs must fit these specifications:
m “PC-100” compliant Synchronous DRAM (SDRAM)
m 3.3 volt (V)
m 64-bit wide, 168-pin module
m Maximum number of 16 memory devices on DIMM
m Unbuffered; do not use registered or buffered Synchronous DRAM (SDRAM), or ECC type
SDRAM
m Height must not exceed 2.0 inches
Note: Different size DRAM DIMMs can be installed in any order in any DIMM slot. Unlike
some older Macintosh computers, DIMMs need not be installed in pairs.
To increase DRAM to the maximum of 1024 MB, fill all four slots with 256 MB DIMMs. Any
256 MB DIMMs you install must use 128 megabit (Mbit) device technology.
For instructions on installing DRAM, see the section “Installing DRAM” on page 36.
About Internal Storage Options
Your Macintosh has five internal drive bays. Three are in the lower part of the computer and
two are in front on top. In many configurations, a single hard disk drive occupies the
computer’s lower rear bay. One of the upper bays contains a CD-ROM, DVD-ROM, or
optional DVD-RAM drive, and some configurations have an optional Zip drive filling the other
upper bay.
If your computer came without an internal Zip drive, you can add one to the upper
drive carrier by purchasing a kit from Apple or from other manufacturers. For more
information on purchasing an internal Zip drive, visit The Apple Store on the World Wide
Web at: http://store.apple.com/
All Power Macintosh G4 computers come with at least one ATA drive occupying a lower bay.
You can add SCSI and ATA drives to the empty drive bays. The number and kinds of drives
you can add depend on the model you purchased.
Important This computer uses SDRAM DIMMs. Only “PC-100” DIMMs from recent Power
Macintosh G3 and Macintosh Server G3 computers 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.