2400mhz vs 2666mhz

Jul 12, 2018
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I plan to purchase additional 16GB memory Crucial/Kingston with 2400Mhz CL17 while my existing notebook has already 16GB memory Hynix 2666Mhz CL19.

My question is
Is there any performance problem when notebook run with both different pieces memory ?

regards,
Alia05
 

COLGeek

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MERGED QUESTION
Question from alianto.sydney : "Notebook memory 2666Mhz and 2400Mhz"