OWC 8566DDR3S8GP 8.0GB - 2 x 4GB -PC-8500 DDR3 RAM Kit for iMac 2009 & MacBook/Pro Unibody 2008-10 & Mac mini 2009-10
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CMS 4GB (2X2GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Early 2009 LAT 2009 Core 2 Duo DDR3 1067 MHz RAM - A47 at Amazon.com
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iMac "Core i5" 2.66 27" (Late 2009) Specs (Late 2009, MB953LL/A, iMac11,1, A1312, 2374): EveryMac.com
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