Go reread
http://www.overclockersclub.com/guides/memory_speed_vs_performance_intel/5.htm
And focus on the average fps:
In Metro 2033: Redux you gained an entire 4 fps going from 1333 to 2400
in Warhammer 40,000 you gained 5 fps going from 1333 to 2400
In Tom Clancy's Ghost Recon: Wildlands you gain 0.05 going from 1333 to 2400.
And the above was a best case scenario using DDR3.
Using ddr4 it gets even tighter
http://www.overclockersclub.com/guides/memory_speed_vs_performance_intel/3.htm
In Metro 2033: Redux you gained 0.7 fps going from 2133 to 3200
in Warhammer 40,000 you gained 0.8 fps going from 2133 to 3200
In Tom Clancy's Ghost Recon: Wildlands you actually lost 0.06 fps going from 2133 to 3200.
Ghost Recon doesn't appear to care at all about the ram speed.
0.06 fps is within the margin of error.
Just to recap as I said before;
Games using Intel cpu's don't respond drastically to an increase in ram speed.
For Ryzen it's a different story though.