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You may be in luck.  There are four logic boards listed for the G4 Titanium.  A 667, 800, 867 and a 1000.  Ben Eiseman is the parts man around here.  He should be able to tell you in the morning which ones will work.  Here's the boards:  http://www.ifixit.com/Mac-Parts/PowerBook-G4-Titanium-DVI-667-MHz

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open