Mac pro 1,1 how can i install lion without efi gpus

i got 2nd hand mac pro 1,1. gpu died
install pc 5770 reported suscessful using in lion without flash.
problem new(old) mac pro doesn't have osx.

how can install lion in situation.

please me baby work. please!!

 

take 4870 out of other mp, put in 1,1 , install lion, should work.

 

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