05-25-2017, 05:08 AM
The 5770 works in a Mac Pro 1,1 and shows the boot screen (if it's the Mac version). Plus, if I'm not mistaken, it's way faster than the others you listed.
If you're going to use an unsupported Nvidia card, I would jump to a newer generation (newer than the ones you and Mavic listed) but not the newEST. Maybe something like a GT730/GT740/GTX750, etc. (Note: I think a card like that will work in that machine but I'm not positive; the idea popped into my head because of their recommendation for Hackintosh stuff and those cards are very affordable, fast and relatively low power.)
If you're going to use an unsupported Nvidia card, I would jump to a newer generation (newer than the ones you and Mavic listed) but not the newEST. Maybe something like a GT730/GT740/GTX750, etc. (Note: I think a card like that will work in that machine but I'm not positive; the idea popped into my head because of their recommendation for Hackintosh stuff and those cards are very affordable, fast and relatively low power.)