Question about G.Skill Ripjaws V

Of course, this also depends very much on what your CPU and the internal memory controller can handle.
According to the spec, your CPU is maxed out at 2666, everything above that is just luck or try & error, increase voltages, adjust timings, different board.
I have had them running at 1.5v on 4000 CL12. But it was also a lot of fiddling with the values