from xbit:
"Take note that the CPUZ utility reports a core voltage of 1.344V. It?s not an error. The screenshot was taken under load (Prime95 utility), so you see the Vdroop effect here.
Unfortunately, we couldn?t conquer the 4.0GHz peak after increasing the core voltage to 1.4V (in BIOS Setup). It means that the Core 2 Duo E7200 is somewhat worse at overclocking than the Core 2 Duo E8000 which can usually speed up above 4GHz easily.
Well, we did make our Core 2 Duo E7200 stable at 4.0GHz but we had to increase the core voltage to 1.5V for that.
We have noted in our previous reviews that Wolfdale series CPUs responds with increased overclockability to an increase in the core voltage. The Core 2 Duo E7200 is not an exception. Increasing the voltage more you can achieve even higher CPU clock rates. Just don?t forget about proper cooling.
As for performance of the overclocked Core 2 Duo E7200, it is about 10% slower than the same-frequency Wolfdale with a 6MB cache in games and about 5% slower in other applications."