DDR4 ram, how fast is to fast?

What is the point of getting 3600MHz DDR4 ram if the best Intel 2011-3 processor (6950X) has a memory spec of 2400/2133MHz and some of the best mobo's for that processor only support up to 3000MHz? Assuming you are overclocking, then speeds of 3600 still don't make sense, or do they?

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