Intel Core 2 Quad Q9400 Processor 2.66 GHz 1333 MHz 6 MB LGA775 EM64T CPU (BX80580Q9400) LGA775 socket processor contains four cores running at 2.66 GHz Processor runs on a 1333 MHz front side bus and has 6 MB of L2 cache 45nm architecture provides better performance and energy efficiency Multimedia acceleration boosts performance in applications such as high-definition video editing and encoding Intelligent Power Capability turns off portions of the processor when not in use for better energy efficiency