The INTEL Q9400 is a Core 2 Quad processor belonging to the Yorkfield family, known for bringing quad-core performance to desktop computing. Operating at 2.66GHz, this processor provides a substantial performance uplift for mainstream users, enthusiasts, and small-medium business applications. With a 6MB L2 cache, the Q9400 efficiently handles data for quickly executing active processes, reducing wait times and improving application responsiveness. The CPU has a thermal design power (TDP) of 95W, balancing quad-core performance with manageable power consumption, making it ideal for users looking to upgrade their system's performance without significantly increasing energy use. It supports a 1333MHz Front Side Bus (FSB), ensuring fast data transfer rates between the CPU, memory, and the motherboard's northbridge chipset. This processor does not feature Intel's Hyper-Threading technology but can efficiently run multiple applications simultaneously, thanks to its quad-core architecture. The Q9400 was popular among PC builders and upgraders for offering a cost-effective way to tap into quad-core performance for improved multitasking, gaming, and content creation experiences on LGA 775 platforms.