Do I need to overclock CPU to achieve the advertised RAM Speeds?

Feb 22, 2018
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So I was wondering. I own the Asus Rog Strix Z270e Gaming, an i7 7700k 4.2Ghz and 32GB of Corsair RAM Vengeance at 3600mhz. I do not overclock.

Based on some research I have done, I noticed that my CPU (and almost all CPUs at this time) support speeds up to 2666mhz. I understand that in order to achieve the higher advertised speed of my RAM memory (3600mhz) I need to enable the XMP profile from BIOS.

The question is: Do I need to overclock the CPU in order to do so? And if not, do I need to overclock CPU anyway in order to get a smoothly running PC? What's the deal with this in general?
 
Feb 22, 2018
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So technically enabling XMP profile means I am overclocking RAM?
 
Feb 22, 2018
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Why would the ram be unstable at 3600?