These guys set the world record for CPU overclock.
The system had a standard Intel Pentium 4 (3.06Ghz). After a visit from our good ol friend liquid nitrogen, they got it overclocked to 5.25Ghz, and with a cool core temperature of -196°C (-320.8°F).
i would have to see some proof of that, like a video... +6ghz is nearly impossible at this time, unless it was a 64bit processor, then it is another class you are talking about.
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