Lenovo Intel Server Processor Upgrade 00YJ691, Hexa-core (6 Core), Clock Speed 3.40 GHz, Overclocking Speed 3.70 GHz, QuickPath Interconnect 9.60 GT/s, Socket R LGA-2011, Compatibility Lenovo x3550 M5 Server, Thermal Design Power 135W. Increase the processing power of your ThinkServer Dual-Socket systems with Intel Xeon E5-2643 family processors to boost your system's performance for advanced applications, technical computing, multithread applications.