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The Power Mac G4 computer uses PC133 compliant, 168-pin SDRAM DIMMs. The mechanical characteristics of the DIMM are given in the JEDEC specification for the 168-pin 8-byte DRAM DIMM. The specification number is JEDEC MO-161; the specification is available from the Electronics Industry Association's website at
http://www.jedec.org/download/pub95/
The electrical characteristics of the DIMM are given in section 4.5.6 of the JEDEC Standard 21-C, release 7. The specification is available from the Electronics Industry Association's website at
http://www.jedec.org/download/pub21/
The RAM DIMMs are required to be PC133 compliant. Information about the PC133 specification is available from Intel's website at
http://developer.intel.com/technology/memory/pcsdram/