IBM System x3250 M4, Инструкция по установке и эксплуатации

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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)
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
Notes:
1. To determine the type of a DIMM, see the label on the DIMM. The
information on the label is in the format xxxxx nRxxx PC3-xxxxx-xx-xx-xxx.
The numeral in the sixth numerical position indicates whether the DIMM is
single-rank (n=1) or dual-rank (n=2).
2. 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
Chapter 3, “Configuring the server,” on page 51.
The following sections provide additional information specific to unbuffered and
registered DIMMs that you must consider.
Unbuffered DIMMs (UDIMMs)
The following notes provide information that you must consider when you install
UDIMMs:
v The memory channels run at the lowest common frequency of the DIMMs
installed.
v
The UDIMM options that are available for the server are 1 GB, 2 GB, 4 GB, and
8 GB (when available) DIMMs.
v
The server supports up to two single-rank or dual-rank UDIMMs per channel.
v The following table lists the supported UDIMM population.
Table 4. Supported UDIMM population per channel
DIMM
connectors per
channel
DIMMs installed
in each channel DIMM type
DIMM speed
Ranks per
DIMM (any
combination)
2 1 Unbuffered
DDR3 ECC 1066, 1333,
1600 Single-rank,
dual-rank
Chapter 2. Installing optional devices
31