@iggy
Sorry to drag up a very old thread but I read this with interest. I couldn't fathom why you needed to to run an 060 at 100MHz and even more confusing was what application you had for running the FPU so hard? Only things I could think of was you are doing raytracing, or you are a scener but at demo parties the productions need to run on the party machine - usually an 060 at 50 to 75MHz or you are one of those overclockers who would think of nothing about cooling their system with liquid nitrogen just because they can!
I have upgraded plenty of Apollo 1260, Blizzrd 1260 and even a few CS-MKII cards to 100+Mhz using the rev 6 version of the full 68060. It runs wuite cool and has been done by a lot of people. Even more so in a CD MKII. I have seen those do 120Mhz.