In my experience the part number CT2KIT51264BF160B in this product description is incorrect. (4GBx2) DDR3L 1600 MT/s (PC3L-12800) 204-pin SODIMM memory - direct CT2KIT51264BF160B that worked great (about $20 more than the first, so my first try). If you search Crucial's reviews for the HM55, you'll see confirmed compatibility reports for the rather specific 256Mx8bit "modular package" that this chipset requires.
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