What RAM to put in the computer?

Question

Iron

I bought a computer https://www.dns-shop.ru/product/1a312b9b020b3330/p...
It says that it has 4GB of RAM. But in the properties of the computer it says that 2.6 GB is available. I was wondering why is that?
And the second question: What operative can be put there. I would like 4GB or 8GB.
Is such an operation suitable there or not? https://www.dns-shop.ru/product/3d1f4ae2da753120/o...
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And what kind of SSD can I put in 128 gigs?
Please give an example. You can immediately link
. Thank you very much in advance))

Answer 1

I understand that if you open the case cover, then the warranty will fly off. Therefore, take it, go to the SC, they will tell you exactly what kind of operative is needed, buy it and they will install it for you.

Answer 2

Kingston has been standing for 5 years, Samsung also stood, but he lived for 3 years and died