A group called LimitTeam managed to overclock AMD's Phenom II X4 955 processor and reach a record speed od 7.1 GHz.
A group named LimitTeam successfully overclocked AMD's Deneb 45nm Phenom II X4 955 processor (Black Edition) back on April 30, and submitted the results for validation to CPU-Z. During the process, the group used the Asus M4A79T Deluxe motherboard, dubbed as the Asus "multidimensional performance platform" featuring support for an AMD 140W CPU and the AMD 790FX/SB750 chipset. Additionally, the group threw in 4 GB of DDR3 memory from Apacer Technology and a ATI Radeon HD 4800 series graphics card. As a result, the group reached 7.127 GHz, beating the previous score of 6.7 GHz. However, LimitTeam didn't reveal any specifics in regards to cooling during the overclocking process.
Late last month, AMD said that it managed to hit 7 GHz in "extreme overclocking tests," more than doubling the original 3.2 GHz clock speeds enjoyed right out of the box. Apparently the CPU can be safely overclocked at home with speeds up to 3.8 GHz; anything greater will need "exotic cooling materials." AMD's product manager Brent Barry was noted saying that liquid nitrogen and liquid helium are best suited for high-overclocking environments, the former bringing the temperature down to about -140 degrees and the latter to around -240 degrees. Unfortunately, both solutions are somewhat dangerous to use. "This is fairly insane, science experiment stuff," Davis said.
Earlier in February, Team Finland reached 6.7 GHz with an early version of the Phenom II X4 955 chip using a similar configuration. However, neither LimitTeam nor Team Finland has overcome to the world-wide #1 score listed by CPU-Z. Clocking in at 8.1 GHz, a user simply named "duck" overclocked Intel's 65nm Cedar Mill Pentium 4 631 processor back on July 20, 2007 using the Asus "Commando" motherboard and 2 GB of DDR2 memory.