[robespierre]

There's no danger of damaging the CPU because its clock speed is not under software control. However, the code that reads the clock speed must know about all the possibilities to display the correct result, and it can be that the 175 MHz PM is too new for the system software you tried.

As an aside, I wouldn't try running a system below 5.3 on an Indy. There were some pretty severe performance problems in early 5.x releases, especially on the Indy, which was the subject of an infamous leaked memo.