IBM x3500 M4 Product Manual page 16

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 in the same server is supported. In such a case all DIMMs operate at

1.5 V.
The maximum number of ranks per channel is eight (with the exception of 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 a 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:

Memory speed supported by specific CPU

Lowest maximum operating speed for the selected memory configuration that depends on rated

speed, operating voltage, and quantity of DIMMs per channel, as shown in the "Max. operating
speed" section in Table 5
Table 5. Maximum memory speeds (Part 1: Intel Xeon processor E5-2600 v2 product family - RDIMMs)
DIMM specification
Rank
Part numbers
Rated speed
Rated voltage
Operating voltage
Max qty supported*
Max DIMM capacity
Max memory capacity
Max. memory at rated speed
Maximum operating speed
1 DIMM per channel
2 DIMMs per channel
3 DIMMs per channel
* The maximum quantity that is supported is shown for two processors installed.
IBM System x3500 M4
Single rank
00D5024 (4 GB)
00D5036 (8 GB)
1600 MHz
1.35 V
1.35 V 1.5 V
24 24
8 GB 8 GB
192 GB 192 GB
None 128 GB
1333 MHz 1600 MHz
1333 MHz 1600 MHz
800 MHz 1066 MHz
RDIMM
Dual rank
00D5044 (8 GB)
1600 MHz
1.35 V
1.35 V 1.5 V
24 24
8 GB 8 GB
192 GB 192 GB
None 128 GB
1333 MHz 1600 MHz
1333 MHz 1600 MHz
800 MHz 1066 MHz
00D5028 (4 GB)
00D5048 (16 GB)
1866 MHz
1.5 V
1.5 V
24
16 GB
384 GB
128 GB
1866 MHz
1600 MHz
1066 MHz
16