You can verify the revision of your card by locating the letter printed in the lowest oval (there are 3 of them) to the left of the plastic receptacle on middle/top of the board. If your card needs an upgrade, please contact tech support. The upgrade is currently 50.00. Project II cards that are Rev G (or earlier) will either not be recognized or throw a DAE -9162 error when installed in a Power Macintosh G4. Rev G1 adds compatibility with G4 computers.