If you have other devices to install or remove, do so now. Otherwise, go to“Completing the installation” on page 71.Memory modulesThe following notes describe the types of dual inline memory modules (DIMMs) thatthe server supports and other information that you must consider when you installDIMMs:v The server supports 1.5 V, 240-pin, 1 GB and 2 GB PC3-10600 or 4 GB, 8 GB,and 16 GB PC3-8500 double data-rate (DDR) III, registered synchronousdynamic random-access memory (SDRAM) with error correcting code (ECC)DIMMs. These DIMMs must be compatible with the latest PC3-10600 orPC3-8500 SDRAM Registered DIMM specifications. For a list of the supportedoptional devices for the server, see http://www.ibm.com/servers/eserver/serverproven/compat/us/.v The server supports up to eight memory cards. Each memory card holds up toeight DIMMs.v At least one memory card with one pair of DIMMs must be installed for theserver to operate.v When you install additional DIMMs on a memory card, be sure to install them inpairs. The DIMMs in each pair must match each other.v You do not have to save new configuration information to the IMM when youinstall or remove DIMMs. The only exception is if you replace a DIMM that wasdesignated as disabled in the Setup utility Memory Settings menu. In this case,you must re-enable the row in the Setup utility or reload the default memorysettings.v When you restart the server after you add or remove a DIMM, the serverdisplays a message that the memory configuration has changed.v Memory cards in connectors 1 and 2 support microprocessor 1, memory cards inconnectors 3 and 4 support microprocessor 2, memory cards in connectors 5 and6 support microprocessor 3, and memory cards in connectors 7 and 8 supportmicroprocessor 4.v There are four memory power buses, which are split among the eight memorycards.v Populate the memory-card connectors to match the microprocessor installation,in the following order: 1, 7, 3, 5, 2, 8, 4, 6. (Microprocessors must be installed inthe following order: 1, 4, 2, and 3. See “Installing a microprocessor” on page 67for more information.)58 IBM System x3850 X5 and x3950 X5 Types 7145 and 7146: Installation and User’s Guide
