How do I know which graphics card is my Computer using??



I want to know which card my computer uses for playing video games. I have noticed occasional lag in my video games and I think it might be due to the game running on the Intel HD graphics.

Here are my PC specs:
1.6 GHz Intel Core i5-4200U with Intel HD Graphics 4400
NVIDIA GeForce GT 740M (2 GB DDR3 dedicated)

I would like to know if there is a way of finding out which graphics card is used during playing my video games?

Thanks in advance!

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