Removing and replacing FRUsThis topic provides information about FRUs.About this taskFRUs must be installed only by trained service technicians.MicroprocessorThis topic provides notes that describe the types of microprocessor that the serversupports and other information that you must consider when you replace amicroprocessor.About this taskThe following notes describe the type of microprocessor that the server supportsand other information that you must consider when you replace a microprocessor:v The optional microprocessors that IBM supports are limited by the capacity andcapability of the server. Any microprocessors that you install must have thesame specifications as the microprocessors that came with the server.v For a list of supported optional devices for the server, see .v The server supports up to four Intel Xeon microprocessors. If you are installingtwo or more microprocessors, they must be the same cache size and type, andthe same clock speed. The server does not support mixing types ofmicroprocessors.v If you are using a two-microprocessor configuration, you must install themicroprocessors in sockets 1 and 4 for PCI Express slots 1 - 4 to be functional.v The server can operate as a symmetric multiprocessing (SMP) server. With SMP,certain operating systems and application programs can distribute the processingload among the microprocessors. This enhances performance for database andpoint-of-sale applications, integrated manufacturing solutions, and otherapplications.v Read the documentation that comes with the microprocessor to determinewhether you have to update the UEFI firmware. To download the most currentlevel of server firmware, go to .v Obtain an SMP-capable operating system. For a list of supported operatingsystems, see .v You can use the Setup utility to determine the specific type of microprocessor inthe server.v Each microprocessor socket must always contain either a heat-sink blank or amicroprocessor and heat sink.160 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
