One little tip I learned when upgrading Laptop memory, is to keep the memory modules that came as original equipment on your laptop.

If you ever have to send the laptop in for warranty repair, throw the original memory modules back in there, and the warranty provider will have one less thing they can point to as causing your problem.

Conversely, if you buy the add'l memory from HP or Dell or Lenovo when you purchase the laptop, it will be included in any warranty they offer, original or extended. Sometimes a laptop manufacturer's warranty will cover third-party memory, but it's hit or miss on that.