Apple IMAC User Manual - Page 5
SGRAM Video Memory, Error Beeps, Macintosh computers. See SGRAM Video Memory in
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Hot Issues Mixed Memory Types - 3 SGRAM Video Memory The iMac computers use SGRAM video memory. Use only SGRAM SO-DIMMs in these machines. Never install the 256K or 512K video memory DIMMs used in older Macintosh computers. (See "SGRAM Video Memory" in the Basics chapter.) Error Beeps If problems are detected upon startup, the iMac system will sound one or more error beeps. (See "Error Beeps" in the Troubleshooting chapter.)
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Hot Issues
Mixed Memory Types - 3
SGRAM Video Memory
The iMac computers use SGRAM video memory. Use only
SGRAM SO-DIMMs in these machines. Never install the
256K or 512K video memory DIMMs used in older
Macintosh computers. (See “SGRAM Video Memory” in the
Basics chapter.)
Error Beeps
If problems are detected upon startup, the iMac system will
sound one or more error beeps. (See “Error Beeps” in the
Troubleshooting chapter.)