Overclockers Club have completed a daunting task, testing the effect of RAM frequency on game performance from DDR3-1333 through DDR4-3200.  In theory Intel's chips will not see the same improvements as AMD's Ryzen, lacking Infinity Fabric which has proved to be sensitive to memory frequency.  Since OCC cover two generations of RAM they also needed to test with two different processors, in this case the i7-4770K and i7-7700K and they tested performance at 1440p as well as 1080p.  Read the full article to see the full results which do show some performance deltas, however they nothing compared to spending more on your GPU.

"After running through all of the tests, it appears that what I previously thought was an easy and clear answer is in fact more complicated. With the evidence provided I can safely say that memory can play a large role in some games over all frame rates. However, other factors like the processor, type of video card, and resolution will usually provide bigger impact in the final frame rates. Strictly speaking of game performances, the fastest memory tested does yield better results."

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