August 18, 2011
64-bit efi rom for 6870
August 18th 2011 Posted to Lion We've done it again, 64-bit efi rom for 6870 for MacPro3,1 and later.
It gives boot screen !
head over to this thread for more info – link
In short, what works: any connection on upper ports(4 ports in line), any allowed combination of them(max 2 legacy (dvi/hdmi, 1 vga)) connections – dl-dvi on dvi port, sl-dvi on hdmi/dvi/mdp(with passive adapters), vga on dvi port with adapter, hdmi on hdmi port. Mdp ports work fine with active adapters or native DP displays. Lower DVI doesnt work at all.
Maximum – 4 screens. For example, if you use active adapters, it can be 3 dl-dvi displays and one sl-dvi.
Bootscreen appears if only one dvi display connected to upper dvi connector (single or dual link).
Steam/dvd player work fine.
I have a Radeon HD 5870 straight from Apple so I won't try this (the 6870s are weaker than the 5870s from what I had been reading following this story) but for those whom want to try to get a cheap PC 6870... you'll apparently need to dump the card's original ROM using a program while booted into Windows if using your own MacPro or from another PC.