GPU not working but intel graphics works fine

Jul 28, 2018
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Basically i have a Nvidea 940MX 2GB graphics card.It was working fine but due to some problem i gave it in repairing center and when i got the laptop repaired a new issue arrised in game fps and gpu is not performing well.

Problem:- When i start a csgo game with nvidea setting for 2-3 minutes starting i gets 160-170fps but suddenly it falls to 5-15 fps and remains constant until i restart the game.
But when i tried to run csgo with intel graphics i get 50-70 fps constant and this time it didnt dropped to 5-15fps.
I cant understand the problem why my game is not working fine on nvidea setting while it works fine on intel garphics settings.
And the same happens with all games
Is there any problem with my gpu??

System:- ASUS
 
Solution
Also note that Windows 10 updates device drivers as well. The Windows 10 graphics drivers are terrible. That may be the problem here. Check the update history during the time that the problem started.

I can tell whenever the Winows 10 updates my graphics driver. It is pretty simple as my secondary monitor goes black every time. Then I have to update the driver manually again.
I would recommend uninstalling the Nvidea driver (you can use an application like DDR after the Windows uninstaller). Then download and install the latest version of the graphics Driver from http://www.geforce.com/drivers. Use the custom option with the clean install.
 
Also note that Windows 10 updates device drivers as well. The Windows 10 graphics drivers are terrible. That may be the problem here. Check the update history during the time that the problem started.

I can tell whenever the Winows 10 updates my graphics driver. It is pretty simple as my secondary monitor goes black every time. Then I have to update the driver manually again.
 
Solution
With an integrated graphics processor like this, the driver is really the only thing that can be updated or corrected. Otherwise make sure that the power brick and battery are in good condition. Make sure that all of the RAM is showing up and that it is at the correct frequency.