Core 2 Quad Q9400S is a desktop processor from Intel released on 18 January 2009, and it is in end-of-life production status now. It belongs to Core 2 Quad family and has a Yorkfield architecture. This processor is built on Intel Socket 775, and uses Gen 2 PCI express connection. 45 nm process is used in production.
Processor has 4 cores and 4 threads, with the base frequency of 2.666 GHz. It has DDR1, DDR2, DDR3 Dual-channel memory support. As for the cache, it supports L1 64K (per core) and L2 6MB (shared).