Asking for help with performance (only fps related)

So today I tried league on linux( not for the first time) previously i had to switch nvidia drivers around until I found the one that gave me decent performance (around 144fps) but now i have a setup with dual gpu AMD 6600 and Nvidia 960gtx, and independently of my graphic settings i can't get above 96fps. Could I have to update my drivers for amd? How do I know which graphic is being used for league? If i need to update my drivers for AMD how do I do it? I thought apt update and upgrade was enough for AMD