What Speed ram is necessary?

[DarkDaedricLord]

I'm building a gaming pc and I am going to overclock. Does the speed make a difference. The higher speed are more expensive but is it worth getting. I'm planning on Corsair Vengeance pro.

 

[N3rdR4ge]

Watch this
https://m.youtube.com/watch?v=dWgzA2C61z4