Graphics Card upgrade?

I'm trying to download Animate on my Mac Pro (mid 2012) but I can't download it until I upgrade to OS Mojave.  In order to do that I need to replace my graphics card.  I currently have two...an ATI Radeon HD 5770 and NVIDIA GeForce 8800 GT.  Does anyone know if I replace one of those with a graphics card that supports Metal (which is required?) will it be enough to run animation software?  Any recommendations for a graphics card for Mac Pro (mid 2012)? Thanks.