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CMS 4GB (1X4GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 2.4 20-Inch Early 2008 - A42 at Amazon.com
iMac 8,1 (20-inch | 24-inch, Early 2008)
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8GB (4GBx2) Team High Performance Memory RAM Upgrade for iMac “Core 2 Duo” 2.66 20-Inch (Early 2008) MB324LL/A iMac 8,1. The Memory Kit Comes with Life Time Warranty. at Amazon.com
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iMac (Early 2008) RAM Upgrade - YouTube
Maximum RAM iMac early 2008 | MacRumors Forums
CMS 2GB (1X2GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 2.8 24-Inch (Early 2008) - A40 at Amazon.com
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CMS 6GB (1X4GB) & (1X2GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 2.4 20-Inch Early 2008 - B117 at Amazon.com
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CMS 6GB (1X4GB) & (1X2GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 2.4 20-Inch Early 2008 - B117 at Amazon.com