I have an AMD K6 200Mhz with MMX, version 19 lets me set the processor type to AMD K6, but it changes back to pentium the next time it is started. As far as I know this would only affect the estimation of time to complete exponents. _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers