you probably won't be able to run the processor at it's default multiplier and fsb, which is 9*133, because the kt133 chipset can't run that fast. however, most 1.2ghz chips are unlocked, so you could run it at 12*100 if you have an a7v rev1.02 or later (i.e. it supports multiplier changes).
i had a 266fsb 1.2ghz athlon on an a7v at 12.5*105=1312mhz without any problems.