Original 9600 CPU cards will only work in a 9600 or 8600. That said, any other PCI series daughterboard CPU will work in the 7600, including G3/G4 PCI series upgrades and dual 604s from a 9500 or third party. You should be able to pick up a single 200MHz 604e for next to nothing. Some reports are that the 7200 G3 that goes in a PCI slot even works.

The Twin Turbo was at the time a high end PCI graphics card - standard issue with the 9500 IIRC. There are no OS X drivers.

Nicely scored in my opinion!