Your AMD processor loves any "CPU utilization" and more importantly, there are a good many Denebs that take a nice little OC even at low volts.
I've got one
You should be able to go 240-250MHz (depending upon your RAMs speed) with the system clock if your motherboard has any *jam* It can't be worse than mine (Biostar nVidia nForce 6150/430 AM2) That will get you to 3.36GHz-3.5GHz
That speed will eliminate any questions you may have about 'bottle-necking' in certain situations.
I can look up the VCore for you but it doesn't matter. It's LOL-low. Like 1.23v at load.
That said, if you have $$$ burning a hole in your pocket, the AMD Phenom II X4 965 Black Edition Deneb
is $85 with code thru the 23rd....
BUT, you could just get a CM Hyper212+ for $25, and an HD7950