21.5 iMac Mid 2011 12,1 A1311 820-3126 Logic Board Core I5 "CPU Not In - Part Haven
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hard drive - Yet Another "Will This CPU Work?" - Mid 2011 iMac 27" Upgrade - Ask Different
2011 iMac 21.5” CPU Upgrade Full Tutorial! - YouTube
Apple iMac 27” Mid 2011 A1312 MC813LL/A MC814LL/A Logic Board 820-2828 - NO CPU | eBay
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iMac 27" 3.1GHz (Mid 2011) | mac of all trades
I recently purchased 2011 21.5 iMac (Mid-2011) and I'm obsessed. : r/mac
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How To Upgrade/Replace Mid-2011 iMac 21.5" Hard Drive To an SSD! - YouTube