How to understand what RAM server memory you need to buy?

Question

RAM

There is a server computer with an x99 motherboard for two processors with aliexpress, it has two 16 GB Atermiter ddr4 RAM sticks, you need to buy 2 more, but I see that this memory is available on alik with different frequencies 2133Mhz 2400Mhz and 2666Mhz. I'm trying to understand what frequency my memory has and different ways show different values. How to understand what frequency I have and is it important when adding RAM?

Answer 1

judging by the first photo, your speed is 2133

Answer 2

With a high probability, all the necessary information is written on the sticker of the bar itself.

Answer 3

If this is server hardware, we go to the manufacturer and look at the compatibility list. If this is not a server, we buy any product from an adequate manufacturer with a testing condition. Timings will be set automatically according to the information from spd (they will be taken according to the maximum delays / minimum speed).