Intel Core 2 Quad Processor Q9400 Frequency 2.66ghz FSB 1333mhz Cache 6MB Socket LGA775 CPU Intel Wide Dynamic Execution , enabling delivery of more instructions per clock cycle to improve execution time and energy efficiency Intel Intelligent Power Capability , designed to deliver more energy-efficient performance Intel Smart Memory Access , improving system performance by optimizing the use of the available data bandwidth Intel Advanced Smart Cache , providing a higher-performance, more efficient cache subsystem. Optimized for multi-core and dual-core processors