83Mhz gives 41.5Mhz PCI bus speed which I think is a little bit too high for many PCI cards and IDE hard drives.
I used 83Mhz bus a lot in the days of Socket 7 before Super 7 boards came out. During that time, it was the ultimate overclocking to run socket 7 Pentium or K6 on 83Mhz bus. As a result, I have killed a couple of hard drives and a CD-ROM. I think that running your system at such a high PCI bus can cause some damage to some IDE devices like harddrives and CD-ROM in the long run.