[ UPDATE: If you are not able to obtain the FSB or QPI use the LGA or Socket size. This spec keeps getting changed around but it closely related to the Socket Size which is the number of pins or contacts on the CPU. Intel's latest LGA is 2011.End of Update ] Understanding Clock Speed, Cores (CPU Specs) and how they effect the computers ability to process data in a timely manner. Computer Education from A1MC.net