that shouldn't harm you as far as i know which isn't as much as id like. how hard are you pushing your pc and are you using a multimeter to check the voltages or just a software indicator.
try using a multimeter and also run a toture test of prime 95 while doing it. my voltages are about that at 166X9.5 but after that they all start to vlow off. i may have to do that 5v mod in hoots sticky.