But not everybody is playing @ 1440p ultra and if you wanna show the impact of RAM, than you have to show that in a CPU limited scenario and the next point is, we dont know your subtimings, because those can have a huge impact too.
In your test we see that faster RAM is providing better lows and if you play @ 1080p 144Hz it will have an impact when you play with fast and optimized RAM (including optimized subtimings).
And with fast RAM you can downclock and undervolt your CPU (very strong UV) and you still will have good FPS, look at my video here:
This is 1080p Ultra Settings: 3.4GHz with fast RAM is faster than 4.2GHz and 3200CL16 RAM.
Power Consumption is up to 200% higher on the 4.2GHz Setting and it is slower!
You know what i mean? Tuning your RAM will provide you with a enormus uplift in performance and it will cost you much much less Power compared to overclocking your CPU (or leaving it @ stock).
With RAM Tuning you can compensate your Performance loss when downclocking and undervolting and as you have seen it is faster while consuming much less power.