The Register: Intel's Yamhill - Itanic on ice? -

A fine scoop by the San Jose Mercury apparently confirms the existence of Intel's 64bit Plan B, codenamed Yamhill.

According the Merc, Yamhill adds 64bit instructions to the existing x86 architecture, and may appear in the Prescott chips, "with an option to turn the features on or off." The emphasis is on 'may', as according to the former Yamhill engineer, no decision has been taken to proceed with Plan B.