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Crucial 4GB 2666MHz DDR4 Single Rank Desktop Memory
Timetec 8GB DDR4 2666MHz (DDR4-2666) PC4-21300 ( (PC4-2666V) Non-ECC Unbuffered 1.2V CL19 1Rx8 Single Rank 260 Pin SODIMM Laptop Notebook PC Computer Memory RAM Module Upgrade (8GB) at Amazon.com
Desktop memory modules (RAM) – ProXtend
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
Performance increase for gamers: Memory with single-rank, dual-rank and quad-rank explained and compared | Practice with benchmarks | igor´sLAB