I could be wrong, but isn't the term "Wallstreet" the code name for the first generation G3 powerbook? what computer do you actually have? As far has how the Radeon will perform in a pci Mac, keep in mind that perfomance will be limited by the bandwith of pci. It will however be better than the stock ATI Rage 16MB card. Faster processor and twice the ram.
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"life is pain, Highness, anyone who tells you different is selling something."--The Man in Black from The Princess Bride