Assuming when you say software you mean drivers to run the card on a Mac?
If your card is supported in MAC OSX the system already has the driver for it. If your card is not listed as being Mac Compatible it may not be. Just because a Mac may support that GPU doesn't mean the card your have does as the BIOS on the card must support MAC. Also know that, that GPU is not supported in the latest MAC OS period as it does not support Apples Metal API. If you are trying to run Windows on your Mac you get the Windows drivers from Apple from the Apple Boot camp site. Boot Camp - Official Apple Support
