Acer Predator X34P Not Overclocking to 120Hz

Lazy

First of all this monitor is awesome and I should've known what to expect but I didnt expect it to be that big, having literally just got it on a black Friday sale and it arriving earlier today. Barely any BLB and pretty much all good out of the box.

Only problem is I cant seem to get the monitor working at 120Hz. I can get it working at 105Hz and 110Hz but as soon as I get to 115Hz or 120Hz the monitor just seems to get into a state of perpetual black, even after using the OSD to overclock and going through to Nvidia Control Panel to change the refresh rate it still does the same thing, sometimes with me accidentally keeping the settings and having to plug another monitor in to sort it out.

I've tried googling for solutions, none so far.
Resetting to factory and trying again, nope.
Updating my Nvidia drivers, nope.

Could it be that I've got a monitor that cant get past 110Hz?
I think another possibility could be my GPU which is a 780 Ti that apparently is DP 1.2, but I would've thought that shouldn't be a problem, someone correct me if I'm wrong. I'm well due an upgrade anyway but I'd rather not since prices are still ridiculous.

Spelunker

@lazytophat

So, all 3440x1440p monitors support a native 100hz and 120hz with overclocking. However, for a smoother gameplay at 120hz, G-Sync requires a GeForce GTX 960 BOOST GPU or higher to overclock the refresh rate. Here is a screen shot from the manual for X34p:



Check out the manual for Acer X34p at the following link: 

https://www.acer.com/ac/en/US/content/support-product/6376?b=1

or:

https://global-download.acer.com/GDFiles/Document/User Manual/User Manual_Acer_1.0_A_A.pdf?acerid=636725018547695449&Step1=MONITOR&Step2=PREDATOR&Step3=X34&OS=ALL&LC=en&BC=ACER&SC=PA_6#_ga=2.239123715.107355684.1542838112-1725534973.1541196016

Spelunker

@lazytophat

So, all 3440x1440p monitors support a native 100hz and 120hz with overclocking. However, for a smoother gameplay at 120hz, G-Sync requires a GeForce GTX 960 BOOST GPU or higher to overclock the refresh rate. Here is a screen shot from the manual for X34p:



Check out the manual for Acer X34p at the following link: 

https://www.acer.com/ac/en/US/content/support-product/6376?b=1

or:

https://global-download.acer.com/GDFiles/Document/User Manual/User Manual_Acer_1.0_A_A.pdf?acerid=636725018547695449&Step1=MONITOR&Step2=PREDATOR&Step3=X34&OS=ALL&LC=en&BC=ACER&SC=PA_6#_ga=2.239123715.107355684.1542838112-1725534973.1541196016

Lazy

Completely forgot about this post since I managed to figure out the problem.

I actually plugged in another PC with a GTX 970 in to test out and that does get the full 120hz, turns out even though the GTX 780 Ti is nearly 3/4 better than a 960 and only slightly better than a 970 in pretty much nearly every way.

I tested this with 2 of these monitors since my other half got extremely jealous as soon as she saw my monitor and wanted one for herself, even though all 3 GPU's support GPU Boost 2.0 and have DP 1.2, the main difference really I suppose is architecture and support for the newer cards which could be why the 780 Ti can only go up to 110hz and the newer ones can go higher.



TLDR: Listed spec is minimum for full output.

Side note: Second monitor is awesome as well with no problems at all and even less BLB than the first, amazing.