Intel plans to demonstrate a 64-bit revamp of its Xeon and Pentium processors in mid-February--an endorsement of a major rival's strategy and a troubling development for Intel's Itanium chip. The demo, which follows the AMD64 approach of Intel foe Advanced Micro Devices, is expected at the Intel developer conference, Feb. 17 through 19 in San Francisco, said sources familiar with the plan. Intel had code-named the technology Yamhill but now calls it CT, sources said. Adding 64-bit features would let "x86" chips such as Intel's Xeon and Pentium overcome today's 4GB memory limit but would undermine the hope that Intel's...