Sempron has been the marketing name used by AMD for several different budget desktop CPUs, using several different technologies and CPU socket formats. The Sempron replaced the AMD Duron processor and competes against Intel's Celeron series of processors. AMD coined the name from the Latin semper, which means "always", to suggest the Sempron is suitable for "daily use, practical, and part of everyday life".
Read more about Sempron: History and Features, Socket 754 32-bit Semprons, Socket S1 (638) 64-bit Semprons, Semprons Without Cool'n'Quiet