Aimed at gamers and computing enthusiasts, the 3.2GHz Phenom II X4 955 BE will compete with the Intel Core 2 Quad Q9550. AMD boasts that their X4 955 BE is capable of running up to 7GHz under extreme cooling conditions...
...AMD spokesperson Matt Davis noted that huge amount of Liquid Helium would be required for extreme cooling while the system is overclocked up to more than twice the frequency offered. However, one can overclock the 3.2GHz Phenom II X4 955 BE to 3.8GHz safely at home with help of conventional fan-cooling method.
Some hobbyists of LimitTeam_Sigh managed to overclock the 3.2GHz AMD Phenom II X4 955 CPU to 6.7GHz using Liquid Nitrogen cooling and the details are listed at the Ripping.org, the overclocking world database.[emphasis mine] - techtree
I'm more interested in the 3.8-GHz-at-home part: so this means all that's needed is the stock fan? Or do third-parties come into play?