After scouring the web I located a modded rom file for the 4GB version of the card. Its obviously the rom from the 2GB Mac card, same one thats been posted here on Mac Rumors. Version number and date are identical. However its been modified to work with the 4GB card. So I flashed my cards, one at a time to be safe, and low and behold I have my beautiful EFI boot screens back. Didnt really know how much I missed them but so glad to have them back.
At this point theres only one issue....
GTX680 4GB - ROM Image - Full Boot Screens, Full Clock Rates & PCI-E 2.0 - 5GT/s
At this point theres only one issue....
GTX680 4GB - ROM Image - Full Boot Screens, Full Clock Rates & PCI-E 2.0 - 5GT/s