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4GB DDR3-1066 2RX8 PC3-8500S SODIMM 1.5V 204 Pin Laptop All in One Apple MICRON | eBay
Timetec 16GB KIT(2x8GB) DDR4 2133MHz PC4-17000 Non-ECC Unbuffered 1.2V CL15 1Rx8 Single Rank 288 Pin UDIMM Desktop PC Computer Memory RAM Module Upgrade (16GB KIT(2x8GB)) at Amazon.com
Beware of the single rank x16 RAM kits sneaked in some laptop models! The 1Rx16 modules have significantly lower bandwidth compared to the 1Rx8 variants - NotebookCheck.net News
Single Rank Memory vs. Dual Rank Memory (vs Quad Rank Memory) - OEMPCWorld