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IBM 4 GB DDR2 SDRAM 4 GB 667 MHz DDR2-667/PC2-5300 ECC DDR2 SDRAM Memory Module PW2821 at Amazon.com
4GB [2x2GB] DDR2-667 (PC2-5300) RAM Memory Upgrade Kit for The Apple iMac 7,1 (20-inch, 2.0GHz, MA876LL/A) Intel Core 2 Duo (Genuine A-Tech Brand) at Amazon.com
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