What's the physical difference between 4 GB RAM and 8 GB RAM? What are they made of? How does it work? - Quora
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Apple iMac 21.5" A1418 Intel Core i5-4640 / 8GB Ram Logic Board P/N 820-4668-A for sale online | eBay
What does it mean for a laptop to have 8GB Onboard + 8 GB DIMM RAM? What exactly is the difference between onboard and DIMM? - Quora
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