Welcome to the Forums DMCollins
 
You are seeking some very specialized assistance. 
 
As this is mostly a volunteer user support forum, you may have much better luck getting assistance if your title was a bit clearer on what you really are asking for help with.
 
May I suggest you change your title to something like:
 
Want a Mac EFI rom or way to boot my MacPro with a EVGA GTX770 SC
 
 

Hi all
 
Cool GTX
   Yes, my title was a bit clear as mud lol thanks for the suggestion to change it.
 
Vlada11
   finding ANY Genuine mac edition GXT cards is not easy, 
don't see many genuine Mac edition cards in trading sites,
Mostly GTX 285 is all I can find,
Rest are all flashed PC cards like MSI and so forth.
 
I would rather go with an EVGA as I have owned a few from me early PC days
And find them to be one of the most reliable Nvidia chipset cards on the market,
last one I owned was the PC edition EVGA GTX 8800 768Mb 384Bit in my last Windows PC,
Very nice card even if they did run a little hot.
 
Have been looking at the GTX 660 and 680,
Was thinking of going GTX 770 so I had a later model card with a bit more grunt.