You need to realize that CAS is just as important as the more "screaming" Mhz number. For example 2133 Mhz memory with CAS 11-11-11 is actually slower and more expensive (dumb, but well, people are not very smart either) than 1866 Mhz 9-10-9.
As a matter of fact, unless you are FILTHY rich - best memory would be 1866 9-10-9.
Besides that, though - there is nearly 0 impact on FPS in reality unless you use iGPU, which I hope you do not. Differense between an okish standard memory and roflbbqrotschild memory is about 1 FPS.