AMD Athlon 64 X2 Dual-Core 4000+ 2.1 GHz Processor Socket AM2 Increase your performance by up to 80%, work or play with multiple programs without any stalling or waiting 2.1 GHz processor provides dual-core system capability in single-core system configurations AMD64 core provides leading-edge performance for both 32-bit and 64-bit applications; 1 MB L2 cache Support for DDR2 SDRAM memory, up to 12.8 GB/s memory bandwidth Cool'n'Quiet technology for quieter operation and reduced power requirements; energy-efficient 65-watt power