Titan is not 'new' silicon, only new to the desktop gaming environment, and has likely been shipping since the Spring of 2012. It became publicly available in the Fall of 2012 with the release of the Tesla K20.
Prior to that, around 20,000 GPUs were 'privately' shipped to the Oak Ridge National Laboratory?s Titan supercomputer where they were paired with approximately 20,000 16-core Opteron CPUs.
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