Adamanta 32GB (2x16GB) Laptop Memory Upgrade Compatible for Dell XPS 15 9550 DDR4 2133Mhz PC4-17000 SODIMM 2Rx8 CL15 1.2v Notebook DRAM 32GB ( 2x16GB ) DDR4 2133 Mhz Non-Parity/Non-ECC Unbuffered SODIMM Memory 260 pin Dual Rank Module. Every module is backed by a limited lifetime warranty. We always have hundreds in stock! Free technical support from our experienced technicians. Every single module is fully tested by the manufacturer. Our experienced technicians can verify if these parts will work for you.