Is it worth it to upgrade RAM on Mid 2010 21.5 iMac? | MacRumors Forums
RAM upgrade considerations for iMac systems - CNET
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How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
iMac RAM Models 11.3 (i5 and i7 only) to 12.2 (8GBx4) | MacMemory.com
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Install memory in an iMac - Apple Support
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Is it worth it to upgrade RAM on Mid 2010 21.5 iMac? | MacRumors Forums
Adamanta 16GB 4x4GB Apple Memory Upgrade for Mid 2010 iMac 21.5" and 27" DDR3 1333Mhz PC3-10600 SODIMM 2Rx8 CL9 1.5v RAM
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Install memory in an iMac - Apple Support
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How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
Install memory in an iMac - Apple Support
Memory RAM Upgrade for Apple iMac 21.5-inch Mid 2010 4GB DDR3 SODIMM | eBay