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#11
Your max is 64 GB. You would need 2x 32GB SO DIMMS at 2666 Mhz. Examples are:
G.SKILL Ripjaws Series 64GB DDR4 2666 Laptop Memory - Newegg.com
A-Tech 64GB (2x32GB) DDR4 2666MHz SODIMM PC4-21300 2Rx8 Non-ECC Unbuffered CL19 1.2V Dual Rank 260-Pin SO-DIMM Laptop Notebook Computer RAM Memory Upgrade Kit - Newegg.com
Team Elite 64GB (2 x 32GB) 260-Pin DDR4 SO-DIMM DDR4 2666 (PC4 21300) Laptop Memory Model TED464G2666C19DC-S01 - Newegg.com
You can use a program such as CPU-Z to detect the current RAM stick(s) installed, and then match their specs: