[SOLVED] Which RAM should I add to my laptop with processor 2133 MHz speed...?

Sep 7, 2021
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Actually, I want to upgrade my laptop RAM. So, when I was searching for compatible RAM for my laptop I got to know that it was already pre-installed(inbuilt) with 4GB 2666 MHz? Do I need to add 8GB of 2400 MHz or 2666MHz?
Specifications
--Motherboard: 832A

--Processor: Intel Core i5 7200U (7th gen)
--Motherboard Clock speed ranges from 2400-2666 MT/s
--The processor supports DDR4-2133.
 
Actually, I want to upgrade my laptop RAM. So, when I was searching for compatible RAM for my laptop I got to know that it was already pre-installed(inbuilt) with 4GB 2666 MHz? Do I need to add 8GB of 2400 MHz or 2666MHz?
Specifications
--Motherboard: 832A
--Processor: Intel Core i5 7200U (7th gen)
--Motherboard Clock speed ranges from 2400-2666 MT/s
--The processor supports DDR4-2133.
Why not shop for an exact match for what you have?
Won't 8GB be enough?