Lenovo 5458 Installation And Service Manual page 71

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
– xf is the device organization or bit width (for example, x4, x8, or x16)
- x4 = x4 organization (4 DQ lines per SDRAM)
- x8 = x8 organization
- x16 = x16 organization
– v is the SDRAM and support component supply voltage (VDD)
- Blank = 1.5 V specified
- L = 1.35 V specified, 1.5 V operable
Note: Values for these voltages are 'specified' which means the device
characteristics such as timing are supported at this voltage. Values are
'operable' which means that the devices can be operated safely at this
voltage. However, device characteristics such as timing may not be
guaranteed. All devices must be 'tolerant' of the highest DDR3 nominal
voltage of 1.5 V, meaning that they may not operate at 1.5 V but may be
powered at that voltage without damage to the devices.
- wwwww is the DIMM bandwidth, in MBps
v 6400 = 6.40 GBps (DDR3-800 SDRAMs, 8-byte primary data bus)
v 8500 = 8.53 GBps (DDR3-1066 SDRAMs, 8-byte primary data bus)
v 10600 = 10.66 GBps (DDR3-1333 SDRAMs, 8-byte primary data bus)
v 12800 = 12.80 GBps (DDR3-1600 SDRAMs, 8-byte primary data bus)
- m is the DIMM type
v E = Unbuffered DIMM (UDIMM) with ECC (x72-bit module data bus)
v R = Registered DIMM (RDIMM)
v 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
Note:
1. To determine the type of a DIMM, see the label on the DIMM. The
information on the label is in the format xGB nRxx PC3v-xxxxxx-xx-xx-xx.
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
"Configuring the server" on page 86.
The following illustration shows the location of the DIMM connectors on the
system board.
Chapter 2. Installing optional devices
55