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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
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memory - Lifebook RAM compatibility - Super User
Lot Of 6 NANYA 2GB 1Rx8 2RX8 PC3-10600U Desktop Memory | eBay
Single vs Dual Rank DD4. What is the performance difference between running 4x(GB) 1Rx8 vs 2x(GB) 2Rx8, given all other variables are equal? - Quora