The Intel Pentium M 'Yonah' dual-core processor is planned for the first quarter of next year. This 65nm mobile processor's FSB will be clocked at 667MHz and the target clock-rate for launch will likely be 2.17GHz. The processor will contain two cores with a shared 2MB L2 cache. Intel explained this will significantly boost performance because the chips communicate with the cache through a single bus embedded in the chip. Intel further added that the dual-core Yonah will mean a large improvement in performance, it won't just be 10 to 20 percent but a lot more.
News source: DV Hardware