Apple iMac (Early 2006) - Manual (Page 69)

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Installing Memory
This chapter provides information and instructions
about installing memory in your iMac.
Your iMac comes with at least 512 megabytes (MB) of Double Data Rate 2 (DDR2)
Synchronous Dynamic Random Access (SDRAM) memory installed. You can add 512 MB
or 1 gigabyte (GB) memory modules to your iMac for a maximum of 2 GB of memory.
Memory modules must meet the following specifications:
 Small Outline Dual Inline Memory Module (SO-DIMM) format
 667 MHz, PC2-5300, DDR2 compliant (also referred to as DDR2 667)
 Unbuffered and unregistered.
Warning: Apple recommends that you have an Apple-certified technician install
memory. Consult the service and support information that came with your iMac for
instructions about how to contact Apple for service. If you attempt to install memory
and damage your equipment, such damage isn’t covered by the limited warranty on
your iMac.