How critical is it to put two different sticks of RAM in a laptop?

Question

Iron

I decided to add the same amount to the existing 4 GB of memory. The search showed that it is not easy to find the same memory on sale. What should you pay attention to when buying memory from another manufacturer?

Answer 1

Pay attention to frequency.
If you insert a bar with a frequency lower than the already installed memory, both will work at a reduced frequency.

Answer 2

It's not
worth it to just insert it immediately upon purchase and check how it works.

Answer 3

Also pay attention to the timings, it is desirable that they match.
Well, from organizational issues - try to agree with the store in advance on the moneyback, in case the bar does not start.

Answer 4

Well, in any case, after installation - memtest, at least for the night.

Answer 5

frequency and timings, verification by load tests after installation
as an option - buy a ready-made set of 8 GB