Imac 9,1 GPU Upgrade.

Hello everyone. I have a customer's imac that I am going to upgrade the GPU on. I was wondering if anyone knew if installing a metal capable graphics card would still work with lower SUPPORTED versions of MacOS for the machine? Currently the machine is on Leopard. I essentially want to flash the card with the custom vbios but then have the OS unchanged.

submitted by /u/SirBoinksALot_
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