Since laptop computers are delicate electronic/mechanical devices that greatly differ between systems, Intel does not recommend opening or upgrading the processor in an laptop computer. If you wish to upgrade a laptop computer, you should contact the laptop manufacturer.

This applies to:

Intel® Core™ Duo Processor Intel® Core™ Solo processor Intel® Core™2 Duo Mobile Processor Mobile Intel® Celeron® Processors Mobile Intel® Pentium® 4 Processors - M Mobile Intel® Pentium® II Processors Mobile Intel® Pentium® III Processor Mobile Intel® Pentium® Processors