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iMac G5, 17-inch Troubleshooting General Information
DDR Memory
iMac G5 computers work with memory modules (DIMMs) that meet all of these criteria:
PC3200, 2.5V, unbuffered, 8-byte, nonparity, 184-pin, 400Mhz DDR SDRAM.
There are two RAM slots. The maximum amount of RAM you can install is 2 GB. You can
use RAM module sizes of 256 MB, 512 MB and 1 GB, in either slot.
DIMMs with any of the following features are not supported in the iMac G5 computer:
registers or buffers, PLLs, ECC, parity, or EDO RAM.