Pentium 60MHz was P5 though, not P54C ... if I'm not mistaken. IIRC the slowest P54C was the 75MHz one as they all had 1.5x multiplier or greater? Again, I wouldn't rule out my memory being wrong.
That sounds correct to me. Also, the P5 was a 5V design! Intel went to 3.3V soon after the very first Pentium CPUs.