I just tested how TPT responds to increased CPU clockspeed via a small overclock, and the performance jumped up immediately after applying the overclock. The CPU I am using is a Core i7 4790k, and I went from 4.4 GHz to 4.6 GHz. So... even just 200 MHz made a significant difference. Interesting IMO.
I am using the Intel Extreme Tuning Utility for the OC.
How much fps difference are we talking?
QuanTech:
How much fps difference are we talking?
About a 20 FPS difference with the frame limit off.