Can i use a second GPU for render scenes in obs

[Bobina]

So i just upgraded from an i3 4160 to a Ryzen 5 2600 but i still have a GTX 960.In games like Fortnite/overwatch i can just lock my framerate to 75(my monitors refresh rate) but in some other games like pubg or rainbow six my gpu is always almost at 99%.Because of that my games run fine but my stream drops frames down to 10-20fps.i have a really old GT430 laying around somewhere in the house.Can i use that to composite and render scenes ?I'm still gone use x264 for my cpu and use the GTX 960 strictly for games.

[wojtepanik]

gt 430 sucks hard, it would lower your overall performance

[Bobina]

will it lower my performance if i use it just for that simple task ? 

i mean im gonna still playing games on my 960