Intel has features called speedstep and c1e, which downclocks the cpu when idling to 1.6ghz and ~.95v to save power and lower heat. It has no affect on performance. If you are getting .23v your pc would be unstable and freeze or shut off, I suspect it is an incorrect reading. I would suggest using cpuz and/or hwmonitor. Cpuz can tell you your actual realtime cpu speed.