When it came to the multiplier, anything over 18.5x and the computer would not boot at all. Even pushing the voltage on the CPU, NB and the HT just as I did with the Phenom II X4 955, I could not get any more out of it without getting too hot and blue screening. When it came to pushing the reference clock, I hit the wall at 211MHz. Just as with the multiplier any more would make the system unstable. During the overclocking I really had to watch the temps because they sat in the low 60C range; the maximum specified temperature for the Phenom II X4 965 is 62C, which made me nervous. It did remain stable so the final settings I ran for the overclock were 3.903GHz at 1.5v and memory speeds of 1689MHz at 7-7-7-20 timings.



Link: Overclockersclub