Chris,
Not sure what a Mac 7300 came with originally, but I seem to remember in the MC days that they explicitely said that the minimum machine was a Power Macintosh G3 - 266Mhz or better and processor upgrade cards were not supported. I know some folks had luck getting it to work, but eovia may not have fixed whatever problem or limitation that prompted Metacreations to stress no upgrade cards so strongly. Their warnings was what helped me make my decision to just buy a new machine instead of trying to pop a harmoni into the old iMac.

Good luck,
Eric Winemiller
Digital Carvers Guild
Freeware and commercial 3D extensions
http://digitalcarversguild.com

Eric Winemiller
Digital Carvers Guild
Carrara and LightWave plug-ins