Hey ssabripo I would set it to 1.425 in bios boot it then check actual voltage with cpuz. If you are in just under 1.4 you should be in great shape.

If you need to go higher on the voltage I will tell you I have to e8400's running at over 1.5 v for just under 9 months now.

Still you should get stable right around 1.4.

WZ