AMD today announced the Athlon MP 2800+ CPU, based on the new Barton-core. This Processor is used in servers and workstations, so normally you won't find it in home PCs :-)
The AMD Athlon MP 2800+ is based on a new core that features more L2 cache than previous AMD Athlon MP processors, and allows additional information to be stored closer to the processor for improved performance. Designed for entry-level servers and workstations, the AMD Athlon MP processor 2800+ complements AMD’s multiprocessing lineup. All AMD Athlon MP processors take advantage of AMD’s stable Socket A infrastructure, which provides an easy upgrade path for IT managers and delivers the compatibility that can help lower a company’s total cost of ownership.