There is a race of processors, the race between two giants, AMD and Intel, to create speedy and reliable processors. And now AMD has just created a new world record of the fastest computer processor by overclocking it FX processor to 8.429 GHz. The previous record of highest processor speed was 8.309 GHz. The new record speed was not an easy achievement. AMD team has to use extreme cooling process to keep the processor cool to get this speed of 8.429 GHz. The temperature was dropped below -225 for extreme cooling by using liquid Helium and Nitrogen. Normal heat conductors and other built in cooling systems can not help to achieve this level.
On August 31, an AMD FX processor achieved a frequency of 8.429GHz, a stunning result for a modern, multi-core processor. The record was achieved with several days of preparation and an amazing and inspired run in front of world renowned technology press in Austin, Texas. This frequency bests the prior record of 8.309GHz, and completely blows away any modern desktop processor. Based on our overclocking tests, the AMD FX CPU is a clock eating monster, temporarily able to withstand extreme conditions to achieve amazing speed. Even with more conservative methods, the AMD FX processors, with multiplier unlocked throughout the range, appear to scale with cold. We also achieved clock frequencies well above 5GHz using only air or sub-$100 water cooling solutions. 
Overclocking is the process of running a computer component at a higher clock rate (more clock cycles per second) than it was designed for or was specified by the manufacturer, usually practiced by enthusiasts seeking an increase in the performance of their computers. People who overclock their components mainly focus their efforts on processors, video cards, motherboard chipsets, and RAM. It is done through manipulating the CPU multiplier and the motherboard’s front-side bus (FSB) clock rate until a maximum stable operating frequency is reached. 
They reached the lowest possible temperature which an AMD FX processor would suffer but it was claimed that there was no bug as result of this extreme cooling. To our satisfaction AMD FX processors passed the first tests, overclocking with liquid nitrogen at temperatures below -180 degrees centigrade. We could find no cold bug, the bane of overclockers, which often stops modern processors from functioning in extremely cold conditions.
Though AMD did this test and proud of it but they are warning home users that such experiment should not be done with out proper safety. Overclocking and extreme cooling will void your hardware warranties and could cause serious damage to your PC hardware. We destroy motherboards, processors, and graphics cards at an alarming rate doing it. Liquid Helium and Liquid Nitrogen are incredibly dangerous in untrained hands and among some of the coldest substances in the universe. This record was achieved by some of the most experienced and methodical overclockers in the world and you should not attempt to recreate this experiment without major safety precautions and seriously thinking about the potential consequences of your actions.