6. If you are instructed to return the DIMM, follow all packaging instructions, anduse any packaging materials for shipping that are supplied to you.Installing a memory moduleThe following notes describe the types of DIMMs that the server supports and otherinformation that you must consider when you install DIMMs (see “System-boardoptional device connectors” on page 19 for the location of the DIMM connectors):v The server supports only industry-standard double-data-rate 3 (DDR3), 1066 or1333 MHz, PC3-8500 or PC3-10600 (single-rank, dual-rank, or quad-rank),registered or unbuffered, synchronous dynamic random-access memory(SDRAM) dual inline memory modules (DIMMs) with error correcting code (ECC).See http://www.ibm.com/servers/eserver/serverproven/compat/us/ for a list ofsupported memory modules for the server.v The maximum amount of memory that the server supports is dependent on thetype of memory that you install in the server. See “Unbuffered DIMMs (UDIMMs)”on page 153 and “Registered DIMMs (RDIMMs)” on page 154 for moreinformation. The server supports a maximum of six single-rank or dual-rankDIMMs, depending on the type of DIMM you install in the server.v The maximum operating speed of the server is determined by the slowest DIMMin the server.v If you install a pair of DIMMs in DIMM connectors 2 and 5, the size and speed ofthe DIMMs that you install in DIMM connectors 2 and 5 must match each other.However, they do not have to be the same size and speed as the DIMMs thatare installed in DIMM connectors 1 and 4.v You can use compatible DIMMs from various manufacturers in the same pair.v When you install or remove DIMMs, the server configuration informationchanges. When you restart the server, the system displays a message thatindicates that the memory configuration has changed.v The specifications of a DDR3 DIMM are on a label on the DIMM, in the followingformat.ggg eRxff-PC3-wwwwwm-aa-bb-ccwhere:ggg is the total capacity of the DIMM (for example, 1GB, 2GB, or 4GB)e is the number of ranks152 IBM System x3250 M3 Types 4251, 4252, and 4261: Problem Determination and Service Guide
