1GB(with 1066) and 2GB(with 1280) MHz for late 2009
Can I put 1GB module into iMac 21,5 (late 2009)? And may be I can use module with 1280MHz?
iMac, macOS 10.13
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Mac's are picky and the correct RAM for your Late 2009 iMac is fairly inexpensive.
For example, you can get 2 2GB modules for under $20 or add a 4GB module for $25
see > https://eshop.macsales.com/shop/memory/iMac/DDR3_21.5_27
If it worked at all it would slow all RAM to 1066 MHz.
1GB(with 1066) and 2GB(with 1280) MHz for late 2009