Bootcamp Install on Mac with unsupported GPU


hi there all.

i'm using macpro 2009 amd radeon 7970 gpu. i've not flashed gpu mac efi, mac doesn't display during startup until loads login screen. totally fine , useable.

problem i'm trying install windows 8 bootcamp partition. when go through bootcamp assistant, old 'no bootable device' error, following tips other people, i've tried rebooting mac , holding down option key can manually select device want boot from.

takes me first issue - can't see screen, can't select boot device in manner because gpu isn't supported natively mac.

know of workaround this? feel little stumped. it'd particularly if there way of setting machine boot usb before reboot. ideas?
 

startup disk preference pane or bootcamp utility
 


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