Hi and welcome to Tom's forum.
You can try and see what happen, if your system isn't stable return it to 1.66V. 0.01V will not kill anything ins your rig.
Thanks. This website is awesomely maintained and all the credit goes to you moderators.
And regarding the question I will keep that voltage as 1.66 coz the just previous voltage available in bios is 1.62.
Thanks for the reply