Memory modules (DIMMs)The server supports up to 32 DIMMs. DIMMs in connectors 1 to 8 supportmicroprocessor 1, DIMMs in connectors 9 to 16 support microprocessor 2, DIMMsin connectors 17 and 24 support microprocessor 3, and DIMMs in connectors 25 to32 support microprocessor 4. The following illustration shows the DIMM connectorson the system board.DIMM 1DIMM 2DIMM 3DIMM 4DIMM 5DIMM 6DIMM 7DIMM 8DIMM 17DIMM 18DIMM 19DIMM 20DIMM 21DIMM 22DIMM 23DIMM 24DIMM 16DIMM 15DIMM 14DIMM 13DIMM 12DIMM 11DIMM 10DIMM 9DIMM 32DIMM 31DIMM 30DIMM 29DIMM 28DIMM 27DIMM 26DIMM 25The following notes describe the types of dual inline memory modules (DIMMs) thatthe server supports and other information that you must consider when you installDIMMs: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 2 GB, 4 GB, 8 GB, and 16 GB double data-rate (DDR) III,registered or unbuffered synchronous dynamic random-access memory (SDRAM)with error correcting code (ECC) DIMMs. These DIMMs must be compatible withthe latest PC3-10600 or PC3-8500 SDRAM Registered DIMM specifications.Note: The amount of usable memory is reduced depending on the systemconfiguration. A certain amount of memory must be reserved for systemresources. To view the total amount of installed memory and the amount ofconfigured memory, run the Setup utility. For additional information, seeChapter 3, “Configuring the server,” on page 75.v At least one pair of DIMMs must be installed for the server to operate.v The following rules apply to ranked DDR3 DIMM speed as it relates to thenumber of DIMMs in a channel:Table 3. DIMM speedDIMMs ineach channel DIMM typeDIMM speed1.5 V 1.35 V1 Single-rank, dual-rank 1333 1333Quad-rank 1333 1066Chapter 2. Installing optional devices 61
