Yes bios flashing is quite easy, I did it to my 9800 non-pro to turn it into a Pro. The whole scraping with an exacto knife is risky though. I personally used an exacto knife to pop off the shim of my 9800, but that's much different from actually scraping away at the card.
That being said, the performance gain from 12 pipelines to 16 is substantial. I don't see myself upgrading to a new video card anytime soon, but if for some reason I did buy an x800 Pro, I would probably try the mod.
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"A casual stroll through the lunatic asylum shows us that faith proves nothing." - Friedrich Nietzsche
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