Here is one of the faster dual core CPUs made for an AMD socket AM2. This Athlon 64 x2 5600+ has part number ADA5600IAA5D0. It uses the Brisbane core with 65nm traces. It draws 89W of power TDP.
AMD Athlon 64 X2 6000+ 3GHz AM2 Dual Core ADA6000IAA6CZ 89W CPU Processor
AMD Athlon 64 X2 5000+CPU 1000 MHz 2.6 GHz Socket AM2 100% Work Processors
Lot of 5 AMD CPUs - Phenom II X4 / A10 / Athlon 64 X2 - Untested
Dell OptiPlex 740 Athlon 64 X2 4600+ 2.4GHz 2GB 80GB CDRW/DVD Desktop
AMD Athlon 64 X 2 5000+ 2.6GHz Dual-Core Processor, ADO5000IAA5DO, AM2-US SELLER
MSI K9N6PGM2-V2 AM2+ MicroATX Motherboard DDR2 AMD Athlon 64 Windows XP Ready