Quick question about GTX Cards

[enny001]

Hi guys i have mac pro 2009 looking to upgrade my video card now i have evega gtx 550ti but need something faster for Davinchi resolve looking at 2 gtx 580 or 670

My question is can i only use evga brand i also see PNY gtx gigabyte gtx can they also be use in my mac pro

Thanks

 

[Synchro3]

You can use each brand. But consider that some cards must be used with an external power supply.