AMD says that the chips are limited edition parts -- less than 100 CPUs will be made -- and won't be made available to the general public. AMD has posted three TWKR photos on their AMD Unprocessed flickr account, and a new Youtube video has been released showing off their OC'ing prowess (CPUs are OC'ed to speeds in excess of 6.5GHz on LN2 and liquid helium). Here are the highlights straight from AMD:

• The AMD Phenom II X4 42 Black Edition TWKR processor is a limited-edition chip created to provide extreme overclockers with a powerful tool to initiate serious performance.
• Designed to reach the utmost performance barriers under extreme cooling, this part demonstrates AMD's superior engineering design quality.
• The TWKR parts can handle more voltage, scale higher, and run faster than other processors on the market.
• As the same processor that AMD used to demonstrate the record-breaking overclocking potential of AMD Phenom II CPUs earlier this year, the TWKR processor is unmatched in yielding high frequencies at extreme cold temperatures, like in this video here.
• With less than 100 processors worldwide, these TWKR processors will not be for sale.
• AMD is giving these parts to select members of the extreme overclocking community as a tribute for their support and to encourage them to push the limits of overclocking.
• AMD understands that overclocking is not for everyone. For mainstream users that don't push their desktop PCs to the absolute limits, the same engineering that goes into the extreme performance of 'TWKR' processors can be found in every AMD Phenom II processor available today.