I currently have a Medion laptop with Intel core i5 6 generation, 6 gb ram and nvidia gt 930mx. If. Me eg: Minecraft games and record with OBS, the video is not liquid. And if I have many programs open one crashes. I'm talking about 5.
Of course, the extra Ram would not hurt, but the problem with the non-volatile game is more likely due to your graphics card.
If yours is built in mxm form, you can substitute them for a (significantly) stronger one.
Which notebook do you have exactly? (Manufacturer and model)
But I'm afraid that in addition to your graphics card and your mobile Intel Core i5 - 6th. Gene. With usually there are only 2 cores / 4 threads with your tasks hopelessly overwhelmed.
The problem is your processor. Minecraft overwhelms the dual core already and OBS gives him the rest.
You can upgrade the RAM, if the current bars are not soldered. Have to take one who has the "laptop format".