What to consider when buying RAM?

I ordered a new notebook, the Dell Inspiron 15 7590, the version with Core i5 and GTX1650. I want to upgrade the RAM directly to 16 GB. The question: What should I pay attention to, so that the memory fits and is as fast as possible?

According to the dealer where I ordered it, the built-in RAM is DDR4 SDRAM with 2666 MHz with "SO DIMM 260-PIN". I picked out a module I think fit (see link below), is this a good choice?

Thanks in advance for the replies!

Pages:

Notebook information (manufacturer):
https://www.dell.com/...590-laptop

Notebook information (dealer):

https://www.ebay.de/...4054614584

RAM module:
https://www.computeruniverse.net/de/samsung-8gb-ddr4-so-dimm-ram-2?utm_channel=psm&agt=509

Yes, you need an 8GB DDR4 SO-DIMM module with 2666MHz clock.
The low-cost storage devices actually all have a CL19 latency at a voltage of 1.2V.
https://geizhals.de/...6%7E256_1x
Choose one, you can check in advance what memory your notebook uses, but that should not make a difference. Whether that's Micron, SK hynix or Samsung This is, does not matter.

Thanks for the insightful answer! A consultation: You said the "cheap storage". So is there a difference in quality / speed to more expensive variants? Does this have a strong impact and what is the price difference?

There are different memory modules. Different manufacturers like the ones mentioned above produce different series and of course there are variations within these series.
Not every memory chip achieves high clock rates, which is why manufacturers / resellers carry out so-called binning, ie sorting according to the achievable clock rates / latencies / voltages.
2666MHz at CL19 latency is not very much, even at 1.2V can do that many, not so good chips that are not suitable for faster memory bars.
That says nothing about their longevity or anything else.
And that's why the memory bars are not that expensive.

Thanks for the detailed answer!