This article provides the memory specifications and upgrade options for the Power Mac G4 (PCI Graphics). Article 58426: " Power Mac G4 (AGP Graphics): Upgrading Memory " has information on upgrading the RAM in that Power Mac G4.

The Power Mac G4 logic board provides four PC-100 DIMM slots that work with industry standard PC-100 DIMMs of up to 256 MB each for a total of 1 GB. The Power Mac G4 works with 64Mbit and 128Mbit RAM. The memory should be rated at 8ns or faster.

Compatible DRAM DIMMs must meet all the following specifications:

• PC-100 Synchronous DRAM (SDRAM)
• 3.3 volt
• 64-bit wide, 168-pin module
• Maximum of 16 memory devices on the DIMM
• Unbuffered; do not use registered or buffered Synchronous DRAM (SDRAM)
• Maximum height of 2.0 inches.