The 570 works well in within MacPro’s power envelope. The biggest issue with MacPro 3,1 is the MacPro itself. The 4,1 and 5,1 perform significantly better. So in terms of performance that’s probably your biggest handicap.
The 680&580 are about equal in resolve performance. Very, very close. The Titan will be faster but also costs more. And doesn’t work on the macs as of now.
590 is outside of the power capabilities of the MacPro, not worth the risk,.. 690 is less power consuming but, like I said, your biggest issue is your CPU. Any of those cards will bottleneck on your MacPro.
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