Memory Module Installation - Lenovo System x3250 M4 Installation And Service Manual

Step 7. Follow the instructions that come with the drive to set any jumpers or switches.
If you have other devices to install, do so now. Otherwise, go to "Completing the installation" on page 54.

Memory module installation

The following notes describe the types of DIMMs that the server supports and other information that you
must consider when you install DIMMs.
• Confirm that the server supports the DIMM that you are installing (see http://www.lenovo.com/
serverproven/).
• When you install or remove DIMMs, the server configuration information changes. When you restart the
server, the system displays a message that indicates that the memory configuration has changed. You
can use the Setup utility to view the server configuration information, see "Using the Setup utility" on
page 64 for more information.
• The server supports only industry-standard double-data-rate 3 (DDR3), 1333 or 1600 MHz, PC3L-12800
(single-rank or dual-rank), unbuffered or synchronous dynamic random-access memory (SDRAM) dual
inline memory modules (DIMMs) with error correcting code (ECC).
• The server supports a maximum of four single-rank or dual-rank unbuffered DIMMs.
• The maximum operating speed of the server is determined by the slowest DIMM in the server.
• If you install a pair of DIMMs in DIMM connectors 1 and 3, the size and speed of the 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 that are installed in DIMM connectors 2 and 4.
• You can use compatible DIMMs from various manufacturers in the same pair.
• The specifications of a DDR3 DIMM are on a label on the DIMM, in the following format.
gGBeRxf PC3v-wwwwwm-aa-bb-cc
where:
– gGB is the total capacity of the DIMM (for example, 1GB, 2GB, or 4GB)
– eR is the number of ranks
– 1R = single-rank
– 2R = dual-rank
– 4R = quad-rank
– xf is the device organization or bit width (for example, x4, x8, or x16)
– x4 = x4 organization (4 DQ lines per SDRAM)
– x8 = x8 organization
– x16 = x16 organization
– wwwww is the DIMM bandwidth, in MBps
• 8500 = 8.53 GBps (DDR3-1066 SDRAMs, 8-byte primary data bus)
• 10600 = 10.66 GBps (DDR3-1333 SDRAMs, 8-byte primary data bus)
• 12800 = 12.80 GBps (DDR3-1600 SDRAMs, 8-byte primary data bus)
– m is the DIMM type
• E = Unbuffered DIMM (UDIMM) with ECC (x72-bit module data bus)
• R = Registered DIMM (RDIMM)
• U = Unbuffered DIMM with no ECC (x64-bit primary data bus)
.
Chapter 2 Installing optional devices
45