You need to go back to that site.
From Sonnet's site:
Installation happens in minutes simply by dropping the new card into the Zero Insertion Force (ZIF) socket that is specially designed to make upgrading effortless. The Encore hardware automatically configures the correct bus ratio without the need for switches.
Compatible Macintosh Models (500 MHz versions)
Power Macintosh G3 All-in-one
Power Macintosh G3 Blue & White
Power Macintosh G3 Desktop
Power Macintosh G3 Minitower
Power Macintosh Server G3
Power Mac G4 (PCI Graphics)
Macintosh Server G4 (PCI Graphics)
Compatible Macintosh Models (1.0 GHz Version)
Power Macintosh G3 Desktop
Power Macintosh G3 Minitower
Note: Support for other platforms coming soon.
Now what Sonnet DID say regarding the B&W was released today at Maccentral.com:
"Sonnet said that it has plans to introduce new speeds and further compatibility with so-called "blue and white" Power Mac G3 and "Yikes" PCI motherboard-equipped Power Mac G4s in the coming weeks."