Custom Resolution Utility (CRU)

[morikalina]

I have Dell U2414H monitor, trying to overclock it but can't be successful.
I'm using DisplayPort cable and have Nvidia GPU (1070).

I click CRU.exe and create a new detailed resolution. Changing values according to other users' experiences. I found a working 72Hz settings for this monitor and tried that. The problem is;
After closing CRU, I click restart.exe and screen goes blank for 1-2 seconds.
Screen comes back and stays like that 3-4 seconds. In this 3-4 seconds I clicked advanced settings for monitor and I saw that it is 64 Hertz. Even If I set 61 or 80 via CRU, it doesn't matter. I always see 64 there.
Screen goes blank again for 1-2 seconds and comes back. It returns to 60 Hertz (also 50 and 59 are selectable settings but I can't see them at CRU?) and overclock is failed I guess?

What I tried so far and not worked
- restart64.exe (since my OS is win10 64bit)
- Restarted system after changing settings
- Tried reset-all.exe and restarting system and starting all over

What am I doing wrong? This is my first time trying to OC something so I may be a little ignorant :/