Clock Chipping Software Incompatibilities
Fortunately there are very few software compatibility issues that arise from clock chipping Macintosh computers. This is reasonable since we're just running the processor (and some of the subsystems) faster; the software ought to be the same. In the few cases where there are compatibility issues, we have always been able to work around them; some are more elegant than others. The incompatibilities are always the result of a new "mach gestalt" being reported for a clock chipped computer. Several Macs report a different mach gestalt when they are clock chipped to faster (or slower) speeds. Take a look at the table in the Mac Crystal Oscillator Speedup History file if you are curious about a certain base machine.