Acer Nitro AN515-43-R2WK: Which RAM should I buy?

Yubel
Yubel Member Posts: 2 New User
I want to buy another 8 GB RAM for my laptop. Memory specifications and also task manager said that it runs at 2400MHz, but from looking into the CPU Z software, I saw that the pre-installed 8 GB RAM has a speed of 2666MHz. Should I buy a 2400MHz or a 2666MHz and also what type of CAS Latency of the RAM should I buy with the pre-installed RAM that I have.

Specifications:
 

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