Video card upgrades for mac pro 1 1 el capitan music production

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Then i heard a guy on YT that says before os x el capitan you dont need to do this, but i have a feeling he is wrong.

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One thing i have not been able to do on this mac is disable ISP, i have tried all the commands that may take me to the utility boot up screen by pressing command R and other combinations but nothing. I have tried almost all the youtube tutorials on how to upgrade and flash firmware 4.1 to 5.1 but so far its been impossible. i have that mac pro 2009 with original graphics card and every thing running os x 10.6.0 (snow leopard)

 

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