According to the image Expreview has on hand, the mark of GT200b on GeForce GTX 260 graphic card will change from 65nm G200-103-A2 to be G200-103-B2. The B means latest 55nm processing technology, and its production cycle happened during the 33rd week of this year (August 11th to 17th), only five weeks after G200-103-A2 which was manufactured in the 28th week.

You can read the entire article at Expreview.