Product Detail Product Type - CPU Processor Type - Intel Xeon Clock Speed - 2.5GHz Bus Speed -- 1333 MHz Bus/Core Ratio -- 7.5 . The "Intel Xeon E5420 2.5 GHz 12M L2 Cache 1333MHz FSB LGA771 Passive Quad-Core Processor" is best product for you. We recommended Intel Xeon E5420 2.5 GHz 12M L2 Cache 1333MHz FSB LGA771 Passive Quad-Core Processor