The chipset will go to 160Mhz+.
The memory probably up to 155Mhz CAS 2, 165Mhz CAS 3, those are average figures.
The rest depends on how your other componants handle the higher PCI speeds involved when raising the FSB.
I have the KK266, 512MB PC-133 Crucial, IBM 75GXP, Gefore 2 Ultra - I have hit about 155Mhz max memory settings, I haven't tried higher.
Good luck!