The Intel® Core 2 Quad Q9400 is a 45nm Yorkfield processor featuring four cores and four threads, operating at a base clock speed of 2.66 GHz. It uses the LGA 775 socket and supports a 1333 MHz front-side bus with 6 MB of shared L2 cache. Designed for multitasking and performance computing, the Q9400 delivers solid efficiency for desktop systems. It supports Intel® Virtualization Technology and SSE4.1 instruction sets, offering reliable performance for productivity and multimedia applications.