If that 1.2G Athlon is a "B", then you're good - if it's a "C" then you'll only get 900MHz out of it, at bit more if you overclock.

The KT133 chipset sounds like it ought to do 133, but it was flawed - KT133A is needed for 133FSB - the KT133 can hit 110FSB overclocked, maybe 120 if you're lucky.
I had a similarly limited AMD Irongate chipset

Matth79 wrote:

If that 1.2G Athlon is a "B", then you're good - if it's a "C" then you'll only get 900MHz out of it, at bit more if you overclock.

The KT133 chipset sounds like it ought to do 133, but it was flawed - KT133A is needed for 133FSB - the KT133 can hit 110FSB overclocked, maybe 120 if you're lucky.
I had a similarly limited AMD Irongate chipset

It seems to be running at 1.2ghz but I haven't run any benchmarks or anything. I'll probably do that next.