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The RAM expansion modules for the iMac are 168-pin SDRAM DIMMs that are 3.3 volt, unbuffered, 8-byte, non-parity, and PC-100 or PC-133 compliant. The speed of the SDRAM devices must be rated at 125 MHz (8 ns) or faster.
ImportantRAM expansion DIMMs for the iMac must use SDRAM devices. If the user installs a DIMM that uses EDO or SGRAM devices, the computer will beep several times when the user attempts to restart the computer.