A voltage increase will help,what is it at now?
Temps and cooling will be a bigger issue if you do raise the voltage,your going to need plenty of case fans and you dont want your tower in an enclosed area.I strongly reccomend a program called .It keeps your temps in your task bar and allows you to set alarms for different temps.It will also give you voltage readings and a few other bells and whistles.Im not sure how the barton core chips perform under different temps but i can tell you with a palomino core you start losing stability around 60c.

