Acer Predator X34A G-Sync problem

iViking

iViking

iViking

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I have used my brand new Acer Predator X34A monitor for a few days, but I have discovered a problem with G-Sync. With G-Sync turned ON and the frame rate capped at 100fps in Assetto Corsa (racing game, if you don't know), I discovered some frame tearing at exactly 100fps. Capping the frame rate at 99fps solved this. But I tried Nvidia's pendulum test, which confirmed that G-Sync will only work up to 99fps on my monitor.

The blurbusters frame rate test shows a valid 100hz refresh for my monitor.

So what's next? Should I send the monitor back for RMA or is there any fix for the G-Sync??
 
I'm not using V-Sync in the game or in the Nvidia control panel. I'm simply capping the frame rate @ 100fps in the Assetto Corsa game settings. But as I Wrote, I'm getting tearing @100fps but not 99fps in both Assetto Corsa and the Nvidia pendulum test, with G-Sync ON and V-Sync OFF.
 
G-Sync is supposed to work up to and including 100hz/100fps. But watching the Nvidia pendulum demo again, I get a few teared frames even at 99fps. So either the G-Sync module is faulty or the 100hz overclock is unstable.
 
Your comments are irrelevant, since V-Sync is only supposed to kick in beyond 100fps and G-Sync is there to handle everything within the monitors refresh rate, which is 100hz. So if G-Sync isn't working at 99 and 100fps, either the G-Sync module isn't working as intended or the monitor simply isn't capable of sustaining the 100hz overclock.
 
Did you actually see any issues or are you purely just looking at a number on some monitoring software?
 
I discovered the screen tearing while playing Assetto Corsa. With the frame rate capped to 100fps in the game settings, I noticed tearing on some tracks during gameplay and replay videos. When I turned the framerate cap back down to 99fps, the tearing mostly disappeared. With the 100fps cap, the game never renders above 99,999 fps. So with a 100hz refresh rate and G-Sync switched ON, frame tearing shouldn't happen at all.

Then I fired up the Nvidia pendulum G-Sync demo, moved the slider to 100fps min./max and saw frame tearing. Moved the sliders back to 99fps and still got the occasional teared frame, albeit not the constant tearing visible during 100fps.
 
No, absolutely not. G-Sync works fine without V-Sync turned on.

V-Sync only needs to be turned on if your fps exceeds the maximum refresh rate of the monitor in question.

Since the refresh rate of my monitor is 100hz, I don't need V-Sync if the frame rates are capped at exactly 100 in the game settings, which is a common feature in racing simulators.
 
Like the others have said ive had this monitor since Jan and found out the hard way you have to have Vsync on in nvidia cp for it to work if you want to play games over 100fps then yes leave it off or create custom profiles like have for cs go but you will get tearing and it will feel strange.

Also your using the game to cap the fps? when Gsync is working it won't let any game go above 100fps so you don't need todo that.
 
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Switch off the artificial frame cap in the game, including any VSync.

Switch on G-Sync and FastSync in the nVidia control panel. This will give you gsync all the way to 100Hz and then cap automatically for everything with no tearing.

If in doubt your gysnc is working, fire up one of the unigen benchmarks and compare the FPS figure outputs with the monitor OSD fps counter - they should be locked.
 
I returned the monitor and got a refund. The IPS glow on dark- and slight coil whine on really bright backgrounds pushed me over the edge. When I game, I usually sit with all the lights turned off at night, so the IPS glow/bleed really got annoying.

I originally bought one of the early "non A" X34 screens back in january 2016, and got one with really bad backlight bleed and loud coil whine. Returned it and got a refund. I then bought the supposedly "fixed" X34A for around £900 (in danish money) on Black Friday. I think I've learned my lesson now, the Acer X34A and Asus PG348Q simply aren't worth twice the price of a 16:9 monitor with QHD and G-Sync.
 
Well, you really weren't listening to anything that anyone told you were you? What's the point of asking the question if you weren't willing to listen to X34 owners?

You've ended up getting rid of possibly the best monitor on the market at the moment (IMHO).

Also, any monitor that is played in a totally dark room will display IPS glow - they aren't designed to be played in a totally dark environment.
 
...Or maybe people weren't listening. The monitor was supposed to deliver smooth G-Sync performance up to and including 100hz/100fps. My monitor had screen tear running only 99fps with G-Sync turned ON. Both 99 and 100fps should have been within the operating window of a 100hz monitor with G-Sync enabled for 100% tear free gaming, which obviously wasn't the case.

I tried the older Nvidia drivers, swithching between DP cable ports on my GTX 1080 and rebooting the 100hz overclock in the monitor OSD. None of that worked, so the monitor I received clearly couldn't deliver 100fps of silky smooth G-Sync'ed goodness. If I wanted to rely on V-Sync or Fast Sync to stop tearing, I could have bought another 21:9 QHD monitor for half the price.
 
iViking said:
...Or maybe people weren't listening. The monitor was supposed to deliver smooth G-Sync performance up to and including 100hz/100fps. My monitor had screen tear running only 99fps with G-Sync turned ON. Both 99 and 100fps should have been within the operating window of a 100hz monitor with G-Sync enabled for 100% tear free gaming, which obviously wasn't the case.
Click to expand...

But why would you use a 3rd party frame rate cap when you can just use vsync? It does the same thing when Gsync is involved expect that one is supported and tested by nvidia and the other isn't?

In my experience, frame rate capping in software such as afterburner is not perfect and does occasionally fluctuate above the set cap by 1 or 2 fps which would cause tearing.
 
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