I'm using a 667mhz dvi PB with an 867mhz board installed. Works fine, even put in a superdrive from a 1ghz model. I'm not even sure which display I'm using. As long as they're the PowerBook G4 Titanium DVI 667mhz, 800mhz. 867mhz, or 1000mhz, REPEAT! DVI! models! Not the 667mhz VGA or the 1ghz Aluminum models, they're pretty much interchangeable. Some have a bluetooth module (1ghz), others don't. The screen resolution changes some between them, also. So, generally speaking, the parts are interchangeable, just not ALL. Do your homework.