IBM 8486 User Guide - Page 32
Installing, memory, module
UPC - 000435839718
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Installing a 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 industry-standard PC2-4200, double-data-rate 2 (DDR2) dual inline memory modules (DIMMs). v The server supports a maximum of two hard disk drives, four DIMMs, and one 5.25-inch device; or, one hard disk drive, four DIMMs, and two 5.25-inch devices; or, two hard disk drives, two DIMMs, and two 5.25-inch devices. v The system board contains four DIMM connectors and supports two-way memory interleaving. v You can install one, two, or four DIMMs in the server, but not three DIMMs. Three DIMMs are not supported. v The DIMM options that are available for the server are 256 MB, 512 MB, 1 GB, and 2 GB. The server supports a minimum of 256 MB and a maximum of 8 GB of system memory. v The amount of usable memory will be reduced depending on the system configuration. A certain amount of memory must be reserved for system resources. The BIOS will display the total amount of installed memory and the amount of configured memory. v The server comes with one 256 MB or 512 MB DIMM installed in the DIMM 1 connector. If the server has one DIMM installed, when you install an additional DIMM, it must be installed in the DIMM 3 connector, and it must be the same size, speed, type, and technology as the DIMM in the DIMM 1 connector. You can mix compatible DIMMs from various manufacturers. When one DIMM is installed, the server runs as a single-channel server. When you add a DIMM in the DIMM 3 connector, the server defaults to a dual-channel server. v DIMMs must be installed in matched pairs. If you install a second pair of DIMMs in the DIMM 2 and DIMM 4 connectors, they do not have to be the same size, speed, type, and technology as the DIMMs in the DIMM 1 and DIMM 3 connectors. However, the size, speed, type, and technology of the DIMMs you install in the DIMM 2 and DIMM 4 connectors must match each other. v Install only 1.8 V, 184-pin, double-data-rate 2 (DDR2), PC2-4200, unbuffered synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC) DIMMs. These DIMMs must be compatible with the latest PC2-4200 SDRAM unbuffered DIMM specification. For a list of supported options for your server, go to http://www.ibm.com/servers/eserver/serverproven/compat/us/; then, select your country and navigate to the list of options for your computer. v When you restart the server after adding or removing a DIMM, the server displays a message that the memory configuration has changed. 20 xSeries 100 Type 8486: User's Guide