Radeon X800XL in PowerMac G4 Sawtooth AGP

A Few Months ago I rescued a AGP Sawtooth G4 from the side of the road near where I live. Found it with a 1.5Ghz CPU Upgrade Card and 1GB of Ram. Unfortunately the GPU is the original rage 128 that it came with from the factory. I’m wanting to do a GPU upgrade on it but am not willing to pay the prices that are being charged for them. My friend has a Diamond Viper X800XL that he’s willing to give me. My question is does anyone know if it possible to mac flash this card for EFI support?
 
Do you have a picture of the card? It is probably keyed for 4x/8x. I think the 9800 is typically the fastest card for the AGP, but some of these are also 4x/8x. I think I read where someone added a notch and it worked fine (under dos).
 
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