I am still running what was originally a Pentium 166. The first thing I ever did inside of a computer besides change a CMOS battery was when I upgraded this computer back in 1997 with an Intel Pentium OverDrive Processor w/MMX Technology boosting it CPU speed to a whopping 200 MHz.
I just checked my SetiLog.csv file and this little computer has done 55 WUs since 6/24/2001 averaging 35:52:15 @ WU or .67 WUs@ Day
Not bad for what is considered an obsolete computer by today's standards.
ppros are not multiplier locked, I think you can help it some but upping the fsb on the board to 75 if it supports it, and changing the multiplier to 3. That ups the cpu to 225 AND gets a little better memory throughput with the 75mhz fsb instead of the 66...