Reply: mac pro 3,1 efi modification ?

Manually editing the plist is good to know how to do. I used to do that as such, but got tired of reading lists of options and arguments to try.

Much better to tick a box (-:

Good luck

ok, i'll try to see that (i don't use clover configurator, i go directly with plist edit pro, an old way, but i'm fine with )
and if i have good results, i'll tell you.

thanks again

Yes. That is correct.

Clover configurator (if you're not familiar) is an app launched from within OS X. While you may not have access to the boot screen, you can use the configurator to quickly and easily mount your EFI partition and edit your working config.plist.

There is an entire pref pane for gfx settings.

Once the OS has loaded, make our changes in the configurator and save the plist and reboot.

You do not have to manually add bootargs from the boot screen.

so, if i understand well...
you say it's possible to initialize a legacy pc graphic card rom, through clover in native efi mode to have bootscreen ? but from my experience with a gtx 650, clover menu don't show up at all on this card. he only show up with my r9 270x.
i didn't try to play with arguments or tweak for gfx.

i'm gonna try, but it's hard when clover won't show up
i'm nearly sure he can't show up on a mac with a pc graphic card wich didn't have uefi rom portion.

but to be clear, yes, all if this card i speak here (gtx 650/780, r9 270x) can work oob with osx (10.8.3+ for all this one) without any tweaks.
my problem is not to get them working under osx, it's only to have access at the bootscreen and boot menu. all of this, without flashing.

So with clover, are you forcing nvidia and adding ID for both cards? You will disable clover boot menu.

Are you using clover configurator utility?

You should install new gfx adapter, then when OS is loaded, adjust your config.plist for new graphics card.

It may take some trial and error to get it right, but consult hackintosh guides for settings. Those nvidia cards should work OOB for the OS like you mentioned, but it takes some tweaking and whatnot to get the progress bar screen to show.

Adjust your confit.plist and reboot, if you don't see the progress bar, make new adjustments and try again.

What if any bootargs are you adding with clover?

I would not attempt this with hybrid scheme, it should be entirely possible (and easier?) with UEFI boot.

i think chameleon should work too, i could started a good old iatkos 10.6.3 distro dvd on my mac pro. and with a non flashed pc graphic card (a gtx 650)
i didn't try to install it, but i will test this to see what happen after install.

clover could work in native mode, but, you can only get the clover menu with a non flashed graphic card. and... only if the rom have uefi support in it.
once you passed clover, screen turn black again until osx has loaded. (i tried this with a R9 270x with hybrid uefi/legacy rom and a GTX 650 with legacy rom)