Hi!

> Would that work if I have a second graphics card ?

To be honest, I am pessimistic. I once tried to use
the real graphics card of a commercial VMWare server
workstation for GPU calculations by making it visible
to the OS inside the virtual computer and just got the
ability to crash the real hardware :-p I actually had
more luck to tune a DJGPP app into using 2 PCI or AGP
graphics cards simultaneously by PCI bus config tricks.

> If the Mac Pro 5,1 would let you boot from USB,
> this wouldn’t be an issue.  

Or from CD or DVD, but I guess the Mac firmware has
never introduced PC compatible BIOS since they went
for PC compatible CPU? So, as said, you would have
to first load a CSM BIOS layer and I have no idea
whether that ever has been done successfully yet?

Given that Mac are a lot more expensive than PC
anyway, you could maybe just acquire any simple
new or 2nd hand PC with the right slot (PCIe?)
for the graphics card, plug it there, boot DOS
from CD or USB, update your graphics BIOS, put
the graphics card back in the PC... Few 100 USD
should be plenty. Or of course ask any friend or
shop whether they let you use their PC for the
task, which should take at most a few hours to
figure out and then just a few minutes to do?

Regards, Eric

PS: It surprises me that you have no Mac version
of the VGA BIOS update installer tool available.
Maybe you just need the right Mac terminology to
find whatever Apple calls the DOS tool you have?



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