lots of people use (200) chips on 133mhz bus, but.... you will need to change the multiplier
if you use default setting the 133mhz bus will run your 1.2ghz at 1.6ghz
most likely your chip wont be able to run that fast so you will need to lower the multiplier
example
1.2ghz(200)=12x100mhz bus
1.2ghz(266)=9x133mhz bus
so if you change the multiplier to 9 then you will be running your 1.2ghz(200) at 1.2ghz(266)
