IBM 3630 M4 User's Guide download pdf (Page 12)

IBM System x3630 M4 12

Memory options

IBM DDR3 memory is compatibility tested and tuned for optimal System x performance and throughput.

IBM memory specifications are integrated into the light path diagnostics for immediate system

performance feedback and optimum system uptime. From a service and support standpoint, IBM memory

automatically assumes the IBM system warranty, and IBM provides service and support worldwide.

The x3630 M4 supports DDR3 memory. The server supports up to six DIMMs when one processor is

installed, and up to 12 DIMMs when two processors are installed. Each processor has three memory

channels, and there are two DIMMs per channel. The following rules apply when selecting the memory

configuration:

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 cases, all DIMMs operate at



1.5 V.

The maximum number of ranks supported per one 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



processors (six DIMMs with one processor installed, 12 DIMMs with two processors installed)

All DIMMs in all processor memory channels operate at the same speed, which is determined as the



lowest value of:

The memory speed supported by the specific processor.



The lowest of maximum operating speeds for the selected memory configuration that depends on



the rated speed, operating voltage, and quantity of DIMMs per channel, as shown under the

"Maximum operating speed" section in Table 4.

Table 4. Maximum memory speeds (Part 1: RDIMMs)

DIMM type

Specification

RDIMM

Rank Single rank Dual rank Quad rank

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

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

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

Max quantity* 12 12 12 12 12 12 12

Largest DIMM 4 GB 4 GB 4 GB 16 GB 16 GB 8 GB 8 GB

Max memory capacity 48 GB 48 GB 48 GB 192 GB 192 GB 96 GB 96 GB

Max memory at rated speed 48 GB 48 GB 48 GB 192 GB 192 GB 96 GB NS**

Maximum operating speed (MHz)

1 DIMM per channel 1333 MHz 1333 MHz 1600 MHz 1333 MHz 1333 MHz 1600 MHz 800 MHz

2 DIMMs per channel 1333 MHz 1333 MHz 1600 MHz 1333 MHz 1333 MHz 1600 MHz 800 MHz

* Maximum quantity supported is shown for two processors installed. When one processor is installed, the

maximum quantity supported is a half of what is shown.

** Rated speed is not supported. Memory DIMMs always operate at speeds lower than rated.

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IBM 3630 M4 User's Guide Page 12

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