Lenovo ThinkPad X280 | SSD Upgrades
For best ThinkPad X280 Laptop performance use the maximum amount of 16GB, fill all the slots with the max allowed memory per slot for your Laptop.
Memory Upgrade for Dell Inspiron 15 (5559) Laptop
The Dell Inspiron 15 3567 laptop memory includes two SODIMM slots with 8GB standard RAM which can be upgraded to a maximum of 32GB DDR4.
Inspiron 15 3000 Setup and Specifications | Dell Vietnam
inspiron-15-3525-laptop | Inspiron 15 3525 Setup and Specifications | memory.