Thatpkmtrainer :
What are your system specs? Motherboard and cpu in particular. Depending on those it may or may not be worth it.
I have a Gigabyte GA-Z97X-Gaming 7 for my Mobo. My Cpu is a i5-4690k (not overclocked)
That is a great board I used to use it. If you play games with Heavy Physx which there are not very many I would add the card. If you do not play those few games I would advised to stay with one single card.
Choice is up to you.
So if I were to add it and keep it in there, would it affect my gameplay? I don't quite understand this stuff and I'd love for you to clear this up for me. I don't want to have to take it out and put it in every time I play certain games. I also don't want to see the poor thing become a paperweight. I thought about making a whole new build with it but I thought that I might can contribute to my current build by dedicating its power to Physx. So should I leave it in or Leave it out?