Cheap and compatible EFI videocard so I can update firmware on my 5,1 machine?

I have an old Mac 5,1 tower that I keep alive with constant upgrades. I want to upgrade the OS and need to do the firmware update. I understand I need an EFI card but do not own the original video card that was in the machine. I'm looking to pick one up just to do this install. Can someone recommend a card I can use for this purpose? I don't want to spend much money on it as I won't be using the card after I get the system updated.

submitted by /u/johndabaptist
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