IBM System x3650 M4 Type 7915 Installation And User Manual page 126

v The following rules apply to DDR3 RDIMM speed as it relates to the number of
v The maximum memory speed is determined by the combination of the
v In two-DIMM-per-channel configuration, a server with an Intel Xeon
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System x3650 M4 Type 7915: Installation and User's Guide
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 operable
L = 1.35 V operable, 1.5 V operable
U = 1.25 V operable, 1.25 V endurant
wwwww is the DIMM bandwidth, in MBps
6400 = 6.40 GBps (DDR3-800 SDRAMs, 8-byte primary data bus)
8500 = 8.53 GBps (DDR3-1066 SDRAMs, 8-byte primary data bus)
10600 = 10.66 GBps (DDR3-1333 SDRAMs, 8-byte primary data bus)
12800 = 12.80 GBps (DDR3-1600 SDRAMs, 8-byte primary data bus)
14900 = 14.93 GBps (DDR3-1866 SDRAMs, 8-byte primary data bus)
17000 = 17.06 GBps (DDR3-2133 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)
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
d is the revision number of the reference design of the DIMM
Note: To determine the type of a DIMM, see the label on the DIMM. The
information on the label is in the format xxxxx nRxxx PC3v-xxxxx-xx-xx-xxx. The
numeral in the sixth numerical position indicates whether the DIMM is single-rank
(n=1), dual-rank (n=2), or quad-rank (n=4).
RDIMMs in a channel:
– When you install 1 RDIMM per channel, the memory runs at 1333 MHz
– When you install 2 RDIMMs per channel, the memory runs at 1066 MHz
– When you install 3 RDIMMs per channel, the memory runs at 800 MHz
Note: For hyper cloud DIMMs, the memory runs at 1333 MHz at performance
mode.
– All channels in a server run at the fastest common frequency.
– Do not install registered, unbuffered, and load reduction DIMMs in the same
server
microprocessor, DIMM speed, DIMM type, Operating Modes in UEFI settings,
and the number of DIMMs installed in each channel.
series microprocessor automatically operates with a maximum memory speed of
up to 1333 MHz when the following conditions is met:
– Two 1.35 V single-rank, dual-ranl, or quad-rank UDIMMs, RDIMMs or
LRDIMMs are installed in the same channel. In the Setup utility, Memory
™
E5-2600