The Core 2 Quad Q9550 2.83 GHz Quad-Core processor from Intel is engineered to deliver performance and power efficiency. Compatible with PC systems, the CPU features FSB Speed - 1333 MHz bus speed and can be installed on motherboards with integrated Socket T slots. For a faster access to the data used most often, this 64-bit Core 2 Quad processor features an integrated L1 cache of 32 KB, 3 MB L2, and 12 MB L3 cache size. In addition, the product has the following manufacturer part number (MPN): AT80569PJ073N.