Custom Resolution Utility (CRU)

[ozgu]

@ToastyX First of all I'd like to thank you for this super beneficial tool, it is much appreciated!

Secondly, because I couldn't find an answer for my specific question I wanted to ask it here.

Since the monitor I use has variable refresh rate feature I have tried to use it but couldn't succeed.
Whenever I activate the Gsync from the Nvidia control panel and start a game or 3d application screen starts to blink and turns black.

According to the data sheet of the monitor following are the frequency ranges:
*DP (v. 1.4): fh:15~120 kHz, fv:24~75 Hz
*HDMI (v. 1.4): fh:15~120 kHz, fv:24~75 Hz

Then by using the CRU I changed the default vertical frequency range from 24-75 to 48-75 and the problem is fixed.
But my question is the reason why the monitor can't handle the 24-75 range for variable refresh rate is because the monitor has some sort of a fault or because the connection cable I use, or the variable refresh rate range is not as broad as it is specified in the data sheet?

The Gpu I use is Nvidia Gtx1080, and the monitor is connected with a Displayport cable which's version I assume is 1.2.
Also, it should be noted that the default Freesync range in the Data blocks section is 48-75.

I would be appreciated if you could help me about it.
Thanks in advance!