This problem is as far as I see it caused by that the 233 mhz version has a 10° C lower alowed operational temp (just check Motorolas specs..) than the 200 mhz and lower ones..
And good old P5 used the same heatsink and fan on them all.. I have even seen som DCE ones using an even smaller fan...
Using this patch just hides an overheating problem! And overheating of the PPC doesn`t prolong its liftime, but kills it slowly instead!
This "patch" is built into and enabled in OS3.9 WarpOS as a standard feature. One actually have to disable it with setting ENVARC:PowerPC/No233Fix to 1
Better cure this problem with improved cooling of the PPC than to hide the problem with this patch!
I have 2 CSPPC's here, one 060/50 and one 060/60 but both 233 mhz 604's. One of them running for years 24/7. Btw. Both Phase 5...