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New iMacs use Intel's unreleased Z68 chipset, allows for hybrid SSD-HDD (and may account for SSD iMac delays) - 9to5Mac
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Amazon.com: Odyson - Logic Board Replacement for iMac 21.5" A1311 (Mid 2011, Late 2011) : Electronics
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For iMac A1311 21.5" MID 2011 820-3126-A 820-2641-A Logic Board System board Motherboard Tested - AliExpress
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