weird multi-monitor 30 fps cap

[⛴²³ mischl ⛄]

Hi players,

I just encountered a strange issue with CS:GO: (every other game I tested runs just fine)
I am using 3 different monitors at the same time:
1. Asus VG278HE 27" 1080p 144Hz
2. LG 24MB56HQ 24" 1080p 60Hz
3. Samsung UE40J5150AS 40" 1080p 60Hz

These are all connected to the same GPU (a GTX 980Ti, no daisy-chaining and no SLI or secondary GPU besides the internal one in the CPU)

Now to the strange part:
Yesterday, I configured monitor 2 and 3 to display the same image via the Windows settings (rightclick on the desktop -> properties...)
Since then, the game is locked to 30fps, no matter what config I attempt to load, or which fps_max value I choose.
Resetting this mirroring setting, will fix the issue instantly, even without exiting CS:GO.
After alt+tabbing back into the game, it instantly runs at 100+ fps again.

So, has anyone of you encountered the same issue and/or has found a fix for this, that lets me keep the mirroring setting, because I really like the simplicity, of running just 2 different images at the same time?!

Thanks for reading this and all answers, hints and clues are of course greatly appreciated.

PC specs:

• i7-8700k
  
• Asus ROG Strix Z370-E Gaming
  
• 16GB DDR4 G.Skill Trident Z 3000Mhz
  
• Gigabyte GTX 980 Ti Gaming G1
  
• Windows 10 Pro 64 bit

[AzKat 🐔]

Go to nvidia's controll panel and in the RESOLUTION tab and set the refresh rates back to their max.

Also you need to disable vsync if you want to get more than 60fps.

Also, why would you want to mirror your screen? Don't you want to have 1 monitor for csgo and 2 for ... other things?

edit: also, it might be limited to 30fps because one of your monitors doesn't support 60FPS at the resolution you're playing at on your main monitor (check it out as well)

[⛴²³ mischl ⛄]

First of all, thanks for your answer.

While using the mirroring setting, all refresh rates in the nvidia control panel are at their specific maximums (144, 60, 60)

VSync is of course disabled, otherwise I would not be able to play at ~300 fps while ingame.

Mirroring the screen is perfect for me, as the 40" TV is pretty far away from my PC near the couch and primarily used for Netflix and Youtube. Therefore I never use this one while playing and only use the other 2.

All monitors support at least 108ßp 60Hz andd the runs at the native resolution (but changing this does not affect the fps cap anyway)

If you ask me, I would suggest, that the game fails to request a max refresh rate, while some displays are mirrored and then simplys falls back to some kind of default value.
I have a HDMI splitter lying around and will test to mirror it this way.

[⛴²³ mischl ⛄]

Originally posted by sk1dd #abFART:

First of all, thanks for your answer.

While using the mirroring setting, all refresh rates in the nvidia control panel are at their specific maximums (144, 60, 60)

VSync is of course disabled, otherwise I would not be able to play at ~300 fps while ingame.

Mirroring the screen is perfect for me, as the 40" TV is pretty far away from my PC near the couch and primarily used for Netflix and Youtube. Therefore I never use this one while playing and only use the other 2.

All monitors support at least 108ßp 60Hz andd the runs at the native resolution (but changing this does not affect the fps cap anyway)

If you ask me, I would suggest, that the game fails to request a max refresh rate, while some displays are mirrored and then simplys falls back to some kind of default value.
I have a HDMI splitter lying around and will test to mirror it this way.

I have just tested the splitter and it works flawlessly! Even the sound is transferred as before and framerates are where they are supposed to be!