v The specifications of a DDR3 DIMM are on a label on the DIMM, in the following
format.
ggg eRxff-PC3-wwwwwm-aa-bb-cc-dd
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)
14900 = 14.93 GBps PC3-1866 SDRAMS, 8-byte primary data bus)
17000 = 17.06 GBps (PC3-2133 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)
L = Load Reduction DIMM (LR-DIMM)
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 file for the design of the DIMM
dd is the revision number of the reference design of the DIMM
v Do not install registered and unbuffered DIMMs in the same server.
v The server supports 1.35-volt (low-voltage) and 1.5-volt DIMMs.
v The server supports a maximum of 12 DIMMs (single-rank, dual-rank, or
quad-rank) on the base system board. If you mix single-rank, dual-rank, or
quad-rank DIMMs in the server, quad-rank DIMMs must be installed first. When
one quad-rank DIMM is installed, it must be installed in DIMM slot 1.
Note: To determine the type of a DIMM, see the label on the DIMM. The
information on the label is in the format xxx nRxxx PC3-xxxxx-xx-xx-xx-xx. The
numeral in the fourth numerical position indicates whether the DIMM is
single-rank (n=1) or dual-rank (n=2).
v The DIMM options that are available for the server are 4 GB, 8 GB, 16 GB, and
32 GB (when available).
v The server supports memory sparing. Memory sparing reserves memory capacity
for failover in the event of a DIMM failure, and the reserved capacity is deducted
from the total available memory. Memory sparing provides less redundancy than
memory mirroring does. If a predetermined threshold of correctable errors is
reached, the contents of the failing DIMM are copied to the spare memory, and
72 System x3630 M4 Type 7158: Installation and User’s Guide
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