Lenovo System x3250 M4, Инструкция по установке и обслуживанию

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(SDRAM) dual inline memory modules (DIMMs) with error correcting code (ECC). For a list of supported
options for the server, see http://www.lenovo.com/ serverproven/; then, select your country and navigate
to the list of options for the server.
• The maximum amount of memory that the server supports is dependent on the type of memory that
you install in the server.
• The amount of usable memory is reduced, depending on the system configuration. A certain amount of
memory must be reserved for system resources. To view the total amount of installed memory and the
amount of configured memory, run the Setup utility. For additional information, see “Using the Setup
utility” on page 64.
• 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.
• 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.Static
electricity that is released to internal server components when the server is powered-on might cause
the server to stop, which could result in the loss of data. To avoid this potential problem, always use an
electrostatic-discharge wrist strap or other grounding system when working inside the server with the
power on.
Attention: Static electricity that is released to internal server components when the server is powered-on
might cause the server to stop, which could result in the loss of data. To avoid this potential problem,
always use an electrostatic-discharge wrist strap or other grounding system when working inside the
server with the power on.
• The specifications of a DDR3 DIMM are on a label on the DIMM, in the following format.
ggge Rx ff -PC3- wwwwwm - aa - bb - cc
where:
– ggg is the total capacity of the DIMM (for example, 1GB, 2GB, or 4GB)
– e is the number of ranks
– 1 = single-rank
– 2 = dual-rank
– 4 = quad-rank
– ff is the device organization (bit width)
– 4 = x4 organization (4 DQ lines per SDRAM)
– 8 = x8 organization
– 16 = x16 organization
– wwwww is the DIMM bandwidth, in MBps
– 8500 = 8.53 GBps (PC3-1066 SDRAMs, 8-byte primary data bus)
– 10600 = 10.66 GBps (PC3-1333 SDRAMs, 8-byte primary data bus)
– 12800 = 12.8 GBps (PC3-1600 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)
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Lenovo System x3250 M4 Installation and Service Guide