Installing Memory
You can install additional dynamic random-access memory (DRAM) in packages called Dual Inline Memory Modules (DIMMs) in the three DRAM DIMM slots on your computer's main logic board. You can expand your computer's DRAM to a maximum of 1536 megabytes (1.5 gigabytes). To check the amounts of DRAM installed, use the Apple System Profiler (located in the Utilities folder, in your computer's Applications folder).
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 search for compatible DIMMs, see the
Macintosh Products Guide.
DIMMs must fit these specifications:
- "PC-133" Synchronous DRAM (SDRAM)
- 3.3 volt (V)
- 64-bit wide, 168-pin module
- Maximum number of memory devices on a DIMM is 16.
- Unbuffered; do not use registered or buffered SDRAM.
- Height must not exceed 2.0 inches.
Note: When purchasing DRAM for use in Macintosh computers, make sure that the memory vendor conforms to the JEDEC specification. Check with your memory vendor to ensure that the DRAM DIMM supports the correct timing modes and that the Serial Presence Detect (SPD) feature has been programmed properly, as described in the JEDEC specification. You can purchase Apple-branded memory online from the Apple Store: store.apple.com
Important: DIMMs from older Macintosh computers may not be compatible with your Power Mac G4. Only "PC-133" DIMMs are compatible. Do not use older DIMMs even if they fit into the DRAM DIMM slots.
Warning
Apple recommends that you have an Apple-certified technician install memory, PCI expansion cards, and internal storage devices. 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 these items yourself, you risk damaging your equipment, and such 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.