IBM 71453RU manual Memory modules

Note: To remove an internal removable flash memory drive, push down on the locking collar to unlock the drive before you remove the drive.

6.Reinstall the power supply (see Installing a hot-swap power supply) and reconnect the power cable.

7.(IBM Business Partners only) Restart the server. Confirm that it starts correctly and recognizes the newly installed devices, and make sure that no error LEDs are lit.

8.(IBM Business Partners only) Complete the additional steps in “Instructions for IBM Business Partners” on page 29.

Memory modules

The following notes describe the types of dual inline memory modules (DIMMs) that the server supports and other information that you must consider when you install DIMMs:

vTo confirm that the server supports the memory modules that you are installing, see http://www.ibm.com/systems/info/x86servers/serverproven/compat/us/.

vAll server model types support 1.5 V, and model types 7143 and 7191 also support 1.35 V, 240-pin, 2 GB PC3-10600 or 4 GB, 8 GB, and 16 GB PC3-8500 double data-rate (DDR) III, registered synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC) DIMMs. Model types 7145 and 7146 also support 1 GB DIMMs and model Types 7143 and 7191 also support 32 GB DIMMs. These DIMMs must be compatible with the latest PC3-10600 or PC3-8500 SDRAM Registered DIMM specifications.

vThe server supports up to eight memory cards. Each memory card holds up to eight DIMMs.

vAt least one memory card with one pair of DIMMs must be installed for the server to operate.

vThe Intel 7500 Scalable Memory Buffer and the Intel 7510 Scalable Memory Buffer are not interchangeable and cannot be used in the same server. Check the label on the top of the memory card and then see http://www-03.ibm.com/ systems/info/x86servers/serverproven/compat/us/ to verify that the memory card you are installing is supported in the server.

vThe server supports an additional 512 GB of memory when the 32-DIMM optional IBM MAX5 for System x memory expansion module is attached to the server. An additional 1 TB of memory is supported when 32 GB DIMMs are installed in model types 7143 and 7191.

vWhen you install additional DIMMs on a memory card, be sure to install them in pairs. The DIMMs in each pair must match each other.

vThe server supports memory sparing. Memory sparing reserves memory capacity for failover in the event of a DIMM failure, and the reserved capacity is subtracted from the total available memory. Memory sparing provides less redundancy than memory mirroring does. If a predetermined threshold of correctable errors is reached, the contents of the failing DIMM are copied to the spare memory, and the failing DIMM or rank is disabled. To enable memory sparing through the Setup utility, select System Settings > Memory. (Memory sparing and memory mirroring cannot be used at the same time.)

vYou do not have to save new configuration information to the IMM when you install or remove DIMMs. The only exception is if you replace a DIMM that was designated 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 memory settings.

64IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Installation and User's Guide