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Replacing a memory module (DIMM)
To replace a dual inline memory module (DIMM), use the following information and procedures:
Supported memory types
Following is information that describes the types of dual inline memory modules (DIMMs) that the server
supports and other information that you must consider when you install DIMMs (see “System-board internal
connectors” on page 108 for the location of the DIMM connectors).
• The server supports only industry-standard double-data-rate 3 (DDR3), 1066 or 1333 MHz, PC3-6400,
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.lenovo.com/thinkserver for a list of supported memory modules for the server.
– The specications of a DDR3 DIMM are on a label on the DIMM, in the following format.
gggeRxff-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
6400 = 6.40 GBps (PC3-800 SDRAMs, 8-byte primary data bus)
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 = 12.80 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)
– aa is the CAS latency, in clocks at maximum operating frequency
– bb is the JEDEC SPD Revision Encoding and Additions level
– cc is the reference design le for the design of the DIMM
– d is the revision number of the reference design of the DIMM
• The server supports unbuffered DIMMs (UDIMM) or registered DIMMs (RDIMM).
• The server supports a maximum of six single-rank or dual-rank DIMMs, depending on the type of DIMM
you install in the server.
122 Hardware Maintenance Manual