Custom Resolution Utility (CRU)

[ozgu]

(03-26-2023 03:39 PM)ToastyX Wrote:  

(03-25-2023 01:46 PM)ozgu Wrote:  @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!

The frequency range in the specs is not necessarily the frequency range supported with FreeSync. You didn't mention what monitor you have. What is the advertised FreeSync range? If there's already a FreeSync data block by default with the range 48-75 Hz, then that might be the correct range. DisplayPort doesn't normally use the FreeSync data block, so maybe NVIDIA's driver is using the range limits instead. If the range limits is used for FreeSync, the horizontal range should be two equal values like 120-120 kHz.

Thank you for your reply.
The monitor is ViewSonic VA3209-2K.
Since this is my first time with a monitor that has variable refresh rate feature, I thought that the frequency range is also range for variable refresh rate.
I have checked the monitor's webpage and its manual but there is no advised/advertised range for variable refresh rate.

And your guess is correct, upper and lower horizontal range limits are equal to each other.

So, in this case is there any need to touch/change anything else other than vertical rate limits? For instance the other data blocks, such as colorimetry, hdr static metadata, video capability etc.

Thanks a lot!