1.60V for the 900MHz-part and 1.75V for the 1.2GHz-part, assuming that the 900MHz Duron is model 3('Spitfire'

which most of them are.
Check the OPN to be sure: Model 3 will have 'D900A
UT1B' while a 900MHz model 7 Duron would be 'D
HD900A
MT1B'.
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