Woah man! 1.57 is way to much! You can kill your chip with those volts faster - I'd say within 3-5 months or less.

Just put the voltage on "auto" - that way the CPU will take the voltage it needs instead of being flooded by power and dying faster.

Personally I need to boot with 1.6v to get to 4Ghz for 3dmark06 to run, but thats only for benching - and that's it.

BTW, those temps are kinda iffy. What are you using to monitor them?