jdb2 writes: "As reported by Legit Reviews AMD has released a limited number of 'TWKR' edition CPUs, also known as AMD Phenom II '42' Black Edition, to a select ( and lucky ) few of the extreme overclocking community as a "Thank you" for their support. These CPUs are basically cherry-picked Phenom II X4 955 BE chips that can take significantly more voltage at the cost of high leakage current. Although these CPUs run hotter, AMD reports that they will at least overclock 100MHz higher on air and 200MHz on liquid-nitrogen/liquid-helium cooling at the same or lower voltage than that of the 955 BE. Confirming this, Tom's Hardware was able to get this chip past 6.4GHz at 1.75v using liquid nitrogen and Legit Reviews was able to reach 4.0GHz at 1.46v using air cooling and 6.6GHz at 1.8v using liquid nitrogen. More impressive results are expected with sophisticated liquid helium setups — official pictures of the CPU from AMD are available here as well as a new extreme overclocking video which is available here.
Unfortunately, only around 100 of these chips are available and are "not for sale" being given away "as is" with no warranty. According to AMD there are currently no plans to make these available for sale.
With that said, there is still a chance of getting one as Maingear and Tom's Hardware are bothholding random drawings in which 2 chips will be given away."