Dual-boot with a PC graphic card


hi everyone,

first want apologize english. i'm french , better @ speaking.

thank amazing ressources can got in place.

here story :

i've got mac pro 4.1 flashed in 5.1 pc gtx 980 gainward no ui @ startup.
i've got sierra sip enabled in 1 ssd , win 10 pro in mechanical disk.
both system working fine.

installed win 10 pro directly dvd method because can't make happened usb stick no boot camp installation.

facts :
can't see alt boot option @ startup.
can't access recovery mode installing refit or disable sip terminal 980.
can't make 980 work sip disabled (get access gt120 mac)
can't install gt120 980 because 980 took 2 slots , got usb3 , pci-e sata adapter in other two.
can't reboot on windows partition because it's not recognized in startup preference (because no bootcamp suppose).

when in windows, restart on mac os x function didn't work had swap nvram access on mac os (and use vnc on iphone web driver switch).

have found thread speaking of issue refind : https://sourceforge.net/p/refind/discussion/general/thread/b655dcc8/?setfreedomcookie

here iam stuck , ****ed. can't go windows , can't install bootmanager bc of graphic card limitations.

question : manage dual boot sierra/win 10 no bootcamp pc graphic card @ end ?

merci
 



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