Question Mixing RAM with different speeds?

Apr 11, 2019
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Hi, I have a 2x8gb kit of TridentZ RGB RAM clocked at 3200mHz. However, it is not overclocked and the motherboard reads it at 2133. Is it possible to put two more 8 GB sticks of TridentZ RGB that are lower speed? (e.g. 3000, 2133, etc) due to the fact that I am not overclocking the RAM? Will it affect performance if I do so? Thank you in advance