Riser-cardassembly6. Remove the adapter, if one is present, from the PCI riser-card assembly.7. Set the adapter and PCI riser-card assembly aside.Memory moduleThe following notes describe the types of dual inline memory modules (DIMMs) thatthe server supports and other information that you must consider when you installDIMMs (see “System-board internal connectors” on page 20 for the location of theDIMM connectors):v To confirm that the server supports the DIMM that you are installing, seehttp://www.ibm.com/systems/info/x86servers/serverproven/compat/us/.v The server supports only industry-standard double-data-rate 3 (DDR3), 1066,1333 and 1600 MHz, PC3-12800 (single-rank or dual-rank), unbuffered,synchronous dynamic random-access memory (SDRAM) dual inline memorymodules (DIMMs) with error correcting code (ECC).v The server supports a maximum of four single-rank or dual-rank unbufferedDIMMs.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 1 and 3, the size and speed ofthe DIMMs that you install in DIMM connectors 1 and 3 must match each other.However, they do not have to be the same size and speed as the DIMMs thatare installed in DIMM connectors 2 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 ranks30 IBM System x3250 M4 Type 2583: Installation and User’s Guide
