just going by this
http://www.custompc.co.uk/reviews/605368/amd-phenom-ii-x4-940-black-edition.html
quote "Previous Phenoms ran so hot that you’d be lucky to increase their clock frequency by more than a few hundred megahertz. However, thanks to its die shrink to 45nm, Phenom II runs much cooler and is therefore far more overclockable.
While our old Phenom X4 9850 Black Edition could only be overclocked from 2.5GHz to 2.8GHz, we could overclock the Phenom II from 3GHz to 3.6GHz. This entailed increasing the CPU multiplier from 15 to 18, and boosting the vcore from 1.336V to 1.45V. This is a fairly small overvolt, but with any more voltage applied, the system wouldn’t POST.
At these settings, the CPC Media Benchmarks score for the Phenom II increased from a mediocre 1,135 to a respectable 1,306. In contrast, the overclocked Phenom scored a dire 999 overall. The G0 stepping of the Q6600 that we tested has a justified reputation for being an excellent overclocker, and we pushed it up from 2.4GHz to 3.6GHz.
At this frequency, its overall Media Benchmarks score rose from 1,038 to 1,478. The overclocked Q6600 also took the lead back from the Phenom II in Cinebench R10 and Folding@home, although it still lagged behind in wPrime 32M. In Crysis, the overclocked Q6600 once again reigned supreme with a faster average frame rate.
However, the Q6600 consumes a lot more power than the Phenom II when overclocked. Its 65nm transistors need a lot of extra voltage to run stably at 3.6GHz, so the overall power consumption of a PC with an overclocked Q6600 is higher than a system with an overclocked Phenom II."