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IBM System x3500 M4 12

Memory options

The IBM System x3500 M4 supports DDR3 memory. The server supports up to 12 DIMMs when one

processor is installed and up to 24 DIMMs when two processors are installed. Each processor has four

memory channels, and there are three DIMMs per channel. 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

DIMM type

DIMM specification

UDIMM RDIMM LRDIMM

Rank Dual rank Single rank Dual rank Quad rank Quad rank

Rated speed 1333 MHz 1333 MHz 1333 MHz 1600 MHz 1066 MHz 1333 MHz

Rated voltage 1.35 V 1.35 V 1.35 V 1.5 V 1.35 V 1.35 V

Operating voltage 1.35 V 1.5 V 1.35 V 1.5 V 1.35 V 1.5 V 1.5 V 1.35 V 1.5 V 1.35 V 1.5 V

Max. qty supported* 16 16 16 24 16 24 24 16 16 24 24

Max. DIMM

capacity

2 GB 2 GB 4 GB 4 GB 16 GB 16 GB 4 GB 16 GB 16 GB 32 GB 32 GB

Max. memory

capacity

32 GB 32 GB 64 GB 96 GB 256GB 384GB 96GB 256GB 256GB 768GB 768GB

Max. operating

speed

______ ______ ______ ______ _______ _______ _______ _______ _______ _______ _______

1 DIMM per channel 1333

MHz

1333

MHz

1333

MHz

1333

MHz

1333

MHz

1333

MHz

1600

MHz

800

MHz

1066

MHz

1333

MHz

1333

MHz

2 DIMMs per

channel

1066

MHz

1333

MHz

1333

MHz

1333

MHz

1333

MHz

1333

MHz

1600

MHz

800

MHz

800

MHz

1066

MHz

1333

MHz

3 DIMMs per

channel

NS** NS** NS** 1066

MHz

NS** 1066

MHz

1066

MHz

NS** NS** 1066

MHz

1066

MHz

* The maximum quantity supported is shown for two processors installed. When one processor installed the

maximum quantity supported is a half of that shown.

** NS = Not supported.

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