You will need a x13.0 multiplier to run at 1.73GHz.
I suggest you set your mobo to Jumperfree mode(look at your ftp://www.asus.it/pub/ASUS/mb/.../a7v133/a7v133-105.pdf
' ">manual, p.18 to find out how to do this) and set your multi to 'auto' or 'default' in BIOS(or you could manually select a x13.0 multi if your BIOS offers that).
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