IBM System x3650 M4 HD
11
The following rules apply when selecting the memory configuration:
The server supports UDIMMs, RDIMMs, and LRDIMMs.
Mixing different types of memory (UDIMMs, RDIMMs, and LRDIMMs) is not supported.
Mixing 1.5 V and 1.35 V DIMMs is supported; in such a case, all DIMMs operate at 1.5 V.
The maximum number of ranks per one channel is eight (except for Load Reduced DIMMs, where
more than eight ranks are supported, because one quad-rank LRDIMM provides the same electrical
load on a memory bus as a single-rank RDIMM).
The maximum quantity of DIMMs that can be installed in the server depends on the number of CPUs,
DIMM type, rank, and operating voltage, as shown in the "Max. qty supported" row in Table 5.
All DIMMs in the server operate at the same speed, which is determined as the lowest value of the
following items:
Memory speed that is supported by the specific CPU.
Lowest of maximum operating speeds for selected memory configuration that depends on rated
speed, operating voltage, and quantity of DIMMs per channel, as shown under the "Maximum
operating speed" section in Table 5.
The following table (Parts 1 and 2) shows the characteristics of the supported DIMMs. Tables cells that
are highlighted with a gray background indicate when the combination of DIMM voltage and the number of
DIMMs per channel still allows the DIMMs to operate at a rated speed.
Table 5. Maximum memory speeds (Part 1: RDIMMs)
DIMM
specification
RDIMM
Rank
Single rank
Dual rank
Part numbers
00D5024 (4 GB)
00D5036 (8 GB)
00D5020 (4 GB)
00D5032 (8 GB)
00D5044 (8 GB)
46W0672 (16 GB)
00D5028 (4 GB)
00D5040 (8 GB)
00D5048 (16 GB)
Rated speed
1600 MHz
1866 MHz
1600 MHz
1866 MHz
Rated voltage
1.35 V
1.5 V
1.35 V
1.5 V
Operating voltage
1.35 V
1.5 V
1.5 V
1.35 V
1.5 V
1.5 V
Max qty supported*
24
24
24
24
24
24
Max DIMM capacity
8 GB
8 GB
8 GB
16 GB
16 GB
16 GB
Max memory capacity
192 GB
192 GB
192 GB
384 GB
384 GB
384 GB
Max. memory
at rated speed
None
128 GB
64 GB
None
256 GB
128 GB
Maximum operating speed
1 DIMM per channel
1333 MHz
1600 MHz
1866 MHz
1333 MHz
1600 MHz
1866 MHz
2 DIMMs per channel
1333 MHz
1600 MHz
1600 MHz
1333 MHz
1600 MHz
1600 MHz
3 DIMMs per channel
800 MHz
1066 MHz
1066 MHz
800 MHz
1066 MHz
1066 MHz
* The maximum quantity that is supported is shown for two processors installed.
