AMD introduced, its latest Phenom II X4 family of high-performance quad-core CPUs, which said to be run as fast as 7 GHz in extreme overclocking tests. Out of the box, the new X4 955 Black Edition, which is aimed at gamers and hobbyists, runs at 3.2GHz, giving it similar performance to Intel's fastest desktop chips at lower cost, AMD says.

However, AMD was able to more than double the CPU's speed during its tests, said Brent Barry, an AMD product manager. The Web site Ripping.org notes that hobbyists with early access to the X4 955 chip have been able to clock it at up to 6.7GHz.

More info: Full Article | X4 940 running at 6.5 GHz (Video)