|Almost all motherboards can accomodate numerous CPUs that run at different speeds. For example, most AMD socket A boards will accept a Duron, Athlon, Athlon XP or Sempron CPU. The speed can range from 600MHz to 2.2GHz. If you want to underclock or overclock the CPU, you can do so, provided the necessary BIOS settings are available AND you know what you're doing.|
You need to be more specific about what you're asking.