IBM 88632SU User Manual - Page 44
Memory, module
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Memory module The following notes describe the types of dual inline memory modules (DIMMs) that the server supports and other information that you must consider when installing DIMMs: v The server supports 333 MHz, 1.8V, 240 pin, PC2-3200 single-ranked double data-rate (DDR) II, registered synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC) DIMMs. These DIMMs must be compatible with the latest PC2-3200 SDRAM Registered DIMM specifications. For a list of the supported options for the server, see http://www.ibm.com/servers/ eserver/serverproven/compat/us/. v The server supports up to four memory cards. Each memory card holds up to four DIMMs. v There must be at least one memory card with one pair of DIMMs installed for the server to operate. v When you install additional DIMMs on a memory card, be sure to install them in pairs. All the DIMM pairs on each memory card must be the same size, and type. v You do not have to save new configuration information to the BIOS when installing or removing DIMMs. The only exception is if you replace a DIMM that was marked as Disabled in the Memory Settings menu. In this case, you must re-enable the row in the Configuration/Setup Utility program or reload the default memory settings. v When you restart the server after adding or removing a DIMM, the server displays a message that the memory configuration has changed. v Install the DIMMs on each memory card in the order shown in the following tables, depending on which memory configuration you want to use. You must install at least one pair of DIMMs on each memory card. Table 3. Primary memory card installation sequence Memory card order Memory card First 1 Second 2 Third 3 Fourth 4 Fifth 1 Sixth 2 Seventh 3 Eighth 4 DIMM pair 1 and 3 1 and 3 1 and 3 1 and 3 2 and 4 2 and 4 2 and 4 2 and 4 Table 4. Alternate memory card installation sequence Memory card order Memory card First 1 Second 3 Third 2 DIMM pair 1 and 3 2 and 4 1 and 3 2 and 4 1 and 3 2 and 4 32 IBM System x3850 Type 8864: User's Guide