<< I don't think most Socket7 motherboard support a 133MHz clock >>
I'm with the above, and in order to run at 133, the PCI must have the 1/4 divder (133/4 = 33Mhz), while the K6-2 board have teh 1/3 divider (100/3 = 33Mhz or 133/3 = 44Mhz), not to mention the AGP which runs on the 2/3 divider on 100Mhz (100*2/3 = 66Mhz), if you boost to 133, you end up with 88Mhz on AGP. Therefore you overclock your PCI bus and AGP bus, which can damage cards and corrupt data on the IDE controller, and not all cards can handle such a boost in clock.
--Mark