Manuals and User Guides for Intel Q9400S - Core 2 Quad 2.66GHz 6M L2 Cache 1333MHz LGA775 Low Power Processor. We have 2 Intel Q9400S - Core 2 Quad 2.66GHz 6M L2 Cache 1333MHz LGA775 Low Power Processor manuals available for free PDF download: Design Manual, Datasheet