I have bought A dell inspiron 15 3542 . it has 4 GB of ram, but I want to install an 16 GB ram. is it possible?
Check Crucial to see the specs for your computer. The Max is 8gb but that might be worth it if you are going to keep the 5 yr old model for awhile. If you are considering a new computer in the near future, stay with 4gb.
Crucial is a good place to buy ram.