I got my hands on a GTX 660ti how would I go around installing it in my existing hackintosh?

I'm assuming I will need nvidea web drivers but when would I install them before I install the card or afterwards

I am currently running: Intel Core i5 4690k

Gigabyte z97 d3h

G.SKILL Ripjaws X Series 8GB

Samsung 850 EVO 500 GB

Currently running MacOS Sierra