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2GB DDR2-800 (PC2-6400) RAM Memory Upgrade for The Apple iMac 8,1 (20-inch, 2.4GHz, MB323LL/A) Intel Core 2 Duo (Genuine A-Tech Brand)
Refurbished 27-inch iMac 3.8GHz 8-core Intel Core i7 with Retina 5K display - Apple
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
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