http://www.digit-life.com/news.html?101572#101572
Today Intel officially announced the migration of desktop 90nm Intel Pentium 4 processors with 1MB L2 cache (Prescott) from C-0 to D-0 revision.
According to the publication, the first Pentium 4 Prescott D-0 samples should arrive on February 27, while all qualification tests are to end on April 23. The first quantities are expected in retail on May 7, 2004.
The reason of this migration to D-0 revision is the planned energy consumption optimization.