Upgrading my System

Hey

I have a question that I am looking for help with.
I have a mac pro 2.66 quad core intel xeon, 16GB memory...
The graphics card is a Nivida Geforce GT 120, 512 MB.
I need a new Graphics cards for starters to work with Resolve and my BMCC. What is the suggested card for this
machine?

thanks

Depending on what you want to invest, you might want to try a GeForce GTX 970 or GTX 980ti. Good value and future proof.