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RAMAXEL 100280746 4GB 1Rx16 PC4-2666V-SC0-11 01AG829 SODIMM RAM for Lenovo 520 - £29.99 | PicClick UK
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