Replacing A Memory Module - IBM x3690 X5 Service Manual

Replacing a memory module

The following notes describe the types of DIMMs that the server supports and
other information (depending on the model) that you must consider when you
install DIMMs (see "System-board optional device connectors" on page 24 for the
location of the DIMM connectors):
v Confirm that the server supports the DIMM that you are installing, see
v The server supports only industry-standard double-data-rate 3 (DDR3), 1333
v The server supports 1.35-volt (low-voltage) and 1.5-volt DIMMs. In addition,
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System x3690 X5 Types 7147, 7148, 7149, and 7192: Problem Determination and Service Guide
http://www.ibm.com/systems/info/x86servers/serverproven/compat/us/.
MHz PC3-10600R-999, 1066 MHz PC3-8500, or 1600 MHz PC3-12800,
(single-rank, dual-rank, or quad-core), registered, synchronous dynamic
random-access memory (SDRAM) dual inline memory modules (DIMMs) with
error correcting code (ECC).
– The specifications of a DDR3 DIMM are on a label on the DIMM, in the
following format.
gGB eRxf-PC3-wwwwwm-a-b-c-d
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
- x f is the device organization or bit width (for example, x4, x8, or x16)
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)
- a is the CAS latency, in clocks at maximum operating frequency
- b is the JEDEC SPD Revision Encoding and Additions level
- c is the reference design file for the design of the DIMM
- d is the revision number of the reference design of the DIMM
support is based on machine type as noted below:
– Machine Types 7148 and 7149:
- Supports 1.5-volt DIMMs at capacities of 2 GB, 4 GB, 8 GB, and 16 GB only.
– Machine Types 7147 and 7192:
- Supports low-voltage (1.35-volt) DIMMs at capacities of 4 GB, 8 GB, 16 GB
or 16 GB LP-RDIMMs, 32 GB only.
- When you mix 1.35-volt and 1.5-volt DIMMs in the server, the server will
operate at the 1.5-volt rate.