Help with G-Sync stuttering

[Manny_NotTheStig]

After toying with the idea for a while i upgraded my monitors (triples) to dell S2716DG's, for 144hz and GSYNC.

I'm running a gtx 1080ti (2000 core 6000 mem) and a 8700K (4.8). Nvidia surround bezel corrected resolution of 7800x1440, and 120hz refresh rate (thats the highest option i have in surround). I primarily use my rig for iracing/streaming and I am having issues with stuttering when racing. I have updated all drivers (nvidia, monitors, BIOS,.....). I have enabled gsync in nvidia control panel, and ensured window display settings screen shows 120hz, as well as each monitor showing 2560x1440, 120hz in their menu. I have tried with nVidia control panel vsync off, on and fast. I havent tried ULMB because i bought gsync monitors, damn it! I have tried both max refresh rate and application controlled gsync options in nvidia control panel. Vsync is disabled in game and I've tried both 120hz cap and no cap.

The stutter happens off and on and its almost as if its running at 60 or 30fps, but frame rate counter shows rates 119 to 120 constantly. The stuuter is worse if connect my fourth monitor (1920x1200, 60hz connected to 1080ti by hdmi) or my fifth monitor (usb powered 800x400 for dashboard application). Streaming doesn't seem to make it worse (or better ?). I'm using the DP cables that came with the monitors.

I've been trying to figure this out over a week now, and i feel like I've done everything short of reinstalling windows. Anyone have any ideas? Really annoying getting this after spending so much for the monitors. Thanks for the replies.

[Brett_UK]

what 1080 ti you useing ?

i thought the 1080 Ti specs say the max digital resolution is 7680x4320 (which is 3x1440p) @60Hz which may be why its stuttring, maybe try at 60hz on all moniter's and with g-sync on and see if it still stutters

Here is a link to the FE 1080 ti and if you look under specs/all specs it shows max supported res

[Manny_NotTheStig]

Here's the gpu i have.

https://m.newegg.com/products/N82E16814137126/specs

 

I hadn't thought about the max resolution/refresh rate. I'm not yet finding the max in the specs on this page. Unfortunately the monitors are not letting me drop them down to three 1080P instead of three 1440P. I wouldn't have minded that as I'm more concerned about higher refresh rate than higher resolution. I'll keep looking.

 

In the meantime, I'll try reinstalling drivers after DDU wipe when i get home from work tonight.

[Manny_NotTheStig]

Please correct me if I'm wrong, but i think i should still be within specs.

 

So, 7680x4320@60hz. If i multiply that out, i would have 1,990,656,000 pixels per second.

I'm running 7800x1440@120hz. That comes out to 1,347,840,000 pixels per second, which is well less than the max.

Even running 7800x1440@144hz = 1,617,408,000 which is still below.

 

I dont think I'm close to the max and I'm sure there are others running the same resolution as me with no issues. It's just gotta be something with my system (drivers, settings,....), or hardware (defective monitor(s)).

[Manny_NotTheStig]

Just realized I've never check gpu memory usage. Could i be experiencing a gpu memory bottleneck? 

 

Edit: Just checked and memory usage for little run was 36% max

[Manny_NotTheStig]

Or could my problem be that i have different revisions? (A04, A07, A07)

[Darkseth]

Did you try using DDU? wipe your GPU Driver, and reinstall the latest.

 

In the last months, i've always updated the Driver normally. Download new one, install it over, done.

At one point, i had a small problem, fps looked fine, frametimes were horrible (and didn't fit the fps kinda..) and it was stuttering.

Example, i had like 130~ fps in South Park, but the game was stuttering like a mess, and Frametimes were jumping between 20 and 40 up and down (which does NOT look right, considering 130 fps. 130 fps = frametimes need to be at around 8ms~

 

If you experience a similar problem (Afterburner can show you strange frametimes), i would try wiping your GPU driver completely, reboot, then install the latest.

 

After i did that, it worked perfectly fine again.

 

 

- No, GPU Memory bottleneck seems pretty much not possible. Neither the size (11gb is plenty.. even for 4k), nor the Bandwidth.

 

- Is your GPU at 99-100% usage all the time, stable?

 

- Can you go play again untill it "stutters" again, and let MSI Afterburner log that for like 10-15 minutes, and either screenshot all the graphs, or upload the Log file? This usually gives all the data needed.

[Manny_NotTheStig]

Thanks for the reply.

I will try to get the log file. My gpu usage is anywhere from 30 to 70% with thr framerate capped at 120.

 

I have uninstalled with DDU and reinstalled. I even tried wiping with DDU and installing an older driver. I'm to the point that I'm going to just reinstall windows 10. 

 

I'm also using a usb powered monitor from doublesight, and i dont know if the drivers are messing things up. The stutter gets worse with this monitor connected. I have disconnected and uninstalled the driver with no difference.